---
product_id: 498988915
title: "CNC Spoilboard Surfacing Router Bit 1/4\" Shank, Slab Flattening Router Bit with 1-3/8\" Cutting Diameter, 2+2 Flutes Insert Carbide Wood Planer Router Bits, Planing Bit for Woodworking"
brand: "binstak"
price: "VT16959"
currency: VUV
in_stock: true
reviews_count: 13
url: https://www.desertcart.vu/products/498988915-cnc-spoilboard-surfacing-router-bit-1-4-shank-slab-flattening
store_origin: VU
region: Vanuatu
---

# 4-sided carbide inserts for extended blade life 1.38" cutting diameter for efficient slab flattening 1/4" shank for universal CNC compatibility CNC Spoilboard Surfacing Router Bit 1/4" Shank, Slab Flattening Router Bit with 1-3/8" Cutting Diameter, 2+2 Flutes Insert Carbide Wood Planer Router Bits, Planing Bit for Woodworking

**Brand:** binstak
**Price:** VT16959
**Availability:** ✅ In Stock

## Summary

> 🔧 Flatten like a pro—surfacing perfection in every pass!

## Quick Answers

- **What is this?** CNC Spoilboard Surfacing Router Bit 1/4" Shank, Slab Flattening Router Bit with 1-3/8" Cutting Diameter, 2+2 Flutes Insert Carbide Wood Planer Router Bits, Planing Bit for Woodworking by binstak
- **How much does it cost?** VT16959 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.vu](https://www.desertcart.vu/products/498988915-cnc-spoilboard-surfacing-router-bit-1-4-shank-slab-flattening)

## Best For

- binstak enthusiasts

## Why This Product

- Trusted binstak brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **CNC & Handheld Ready:** Seamlessly integrates with CNC machines, handheld routers, and table-mounted tools for professional-grade results.
- • **Industrial-Grade Steel Body:** Built tough with anti-kickback features for safer, stable operation under heavy loads.
- • **Cost-Effective Carbide Inserts:** Rotate or replace blades easily—maximize lifespan without replacing the entire bit.
- • **Versatile Material Compatibility:** Perfect for hardwood, MDF, plywood, laminate, acrylic, and more—your all-in-one surfacing solution.
- • **Precision Engineered 2+2 Insert Design:** Balanced cutting action ensures ultra-smooth surface finishes every time.

## Overview

The BINSTAK CNC Spoilboard Surfacing Router Bit features a 1/4" shank and a 1.38" cutting diameter with a unique 2+2 insert carbide design. Engineered with a super-strong steel body and 4-sided rotatable carbide inserts, it delivers smooth, precise slab flattening on a wide range of wood and composite materials. Compatible with CNC and handheld routers, this cost-effective bit offers extended blade life and safer operation, making it a must-have for woodworking pros aiming for flawless finishes.

## Description

The surfacing router bit utilizes 4-sided solid carbide inserts. All 4 edges of carbide inserts can be used, use a screwdriver to make other blade edge outside. Replace the carbide inserts when needed, instead of replacing the whole bit. Cost effective solution compared to brazed router bits and solid carbide spiral bits.

## Features

- 2+2 INSERTS CNC ROUTER BIT: Shank: 1/4"; Cut Diameter: 1-3/8" ; Carbide Inserts: 12*12mm. 2+2 inserts design, resulting in a more balanced tool while running and get a smoother surface. The Router Bit comes with insert blades. For more blades, please purchase the K1222 model. ASIN：B0B1MJ9Z9P
- INDUSTRIAL GRADE CNC WOOD ROUTER BIT: Super-strength steel body with anti kickback design, 4 cutting blades.
- COST-EFFECTIVE INSERT BIT: The surfacing router bit utilizes 4-sided solid carbide inserts. All 4 edges of carbide inserts can be used, use a screwdriver to make other blade edge outside. Replace the carbide inserts when needed, instead of replacing the whole bit. Cost effective solution compared to brazed router bits and solid carbide spiral bits.
- This planer router bit is perfect for wood slabs flattening, resurface or plane the top surface of the spoilboard. Used on soft and hard woods, particle board, MDF, plywood compact panel, laminate, acrylic and etc.
- Use on CNC and other automatic routers as well as hand-held and table-mounted portable routers. Such as woodworking engraving machine, trimming machine, etc.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Asin | B0BNPYDT94 |
| Best Sellers Rank | #13,163 in Tools & Home Improvement (See Top 100 in Tools & Home Improvement) #4 in Edge Treatment & Grooving Router Bits |
| Brand Name | BINSTAK |
| Customer Reviews | 4.5 4.5 out of 5 stars (2,102) 4.5 out of 5 stars |
| Cut Type | Straight Cut |
| Cutting Diameter | 1.38 Inches |
| Included Components | Router Bit, 4 Extra Screws, T15 Wrench |
| Item Diameter | 1.38 Inches |
| Item Weight | 0.12 Kilograms |
| Manufacturer | BINSTAK |
| Material Type | Alloy Steel, Carbide |
| Model | B216 |
| Number Of Flutes | 4 |
| Part Number | B216 |
| Size Name | 1/4" Shank-1-3/8" Cut Dia. (2+2 Inserts) |

## Product Details

- **Brand:** BINSTAK
- **Cut Type:** Straight Cut
- **Item Weight:** 0.12 Kilograms
- **Material:** Alloy Steel, Carbide
- **Size:** 1/4" Shank-1-3/8" Cut Dia. (2+2 Inserts)

## Images

![CNC Spoilboard Surfacing Router Bit 1/4" Shank, Slab Flattening Router Bit with 1-3/8" Cutting Diameter, 2+2 Flutes Insert Carbide Wood Planer Router Bits, Planing Bit for Woodworking - Image 1](https://m.media-amazon.com/images/I/51t16jiVngL.jpg)
![CNC Spoilboard Surfacing Router Bit 1/4" Shank, Slab Flattening Router Bit with 1-3/8" Cutting Diameter, 2+2 Flutes Insert Carbide Wood Planer Router Bits, Planing Bit for Woodworking - Image 2](https://m.media-amazon.com/images/I/71qVZu+RFkL.jpg)
![CNC Spoilboard Surfacing Router Bit 1/4" Shank, Slab Flattening Router Bit with 1-3/8" Cutting Diameter, 2+2 Flutes Insert Carbide Wood Planer Router Bits, Planing Bit for Woodworking - Image 3](https://m.media-amazon.com/images/I/61fFEIJCERL.jpg)
![CNC Spoilboard Surfacing Router Bit 1/4" Shank, Slab Flattening Router Bit with 1-3/8" Cutting Diameter, 2+2 Flutes Insert Carbide Wood Planer Router Bits, Planing Bit for Woodworking - Image 4](https://m.media-amazon.com/images/I/61Glp2gPTaL.jpg)
![CNC Spoilboard Surfacing Router Bit 1/4" Shank, Slab Flattening Router Bit with 1-3/8" Cutting Diameter, 2+2 Flutes Insert Carbide Wood Planer Router Bits, Planing Bit for Woodworking - Image 5](https://m.media-amazon.com/images/I/61g4DTgNumL.jpg)

## Available Options

This product comes in different **Pattern, Size** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Slow and easy gets the job done safely. Exceeded expectations flattening this maple burl.
*by  on Reviewed in the United States February 9, 2026*

Wicked sharp! Works as advertised. Rotating cutters extends life and almakes for an excellent value. Highly recommend.

### ⭐⭐⭐⭐⭐ A Flattening BEAST
*by  on Reviewed in the United States April 24, 2026*

Built a gian 22x22x6" chopping block made of white oak, and needed a way to flatten it. It was too tall for my CNC, so I used a router sled and this chonk of a flattening bit. Having flattened on a CNC with a wee 1/2" bit, I started this taking a tiny amount and overlapping by half. After a few minutes, I noticed I was getting dust, not chips. Rather than size the board in tiny steps, I lowered the bit a couple of mm to try again. I was paying attention to make sure the router didn't get bogged down, the board didn't move, and that my lines looked clean. This thing just CHEWED through the endgrain and left me with a super flat surface with no burnout whatsoever. Sanding from this point was so easy with such a smooth surface.If you're on the fence, get off the fence and buy the thing. It's a chonk, seems like it's a great quality, and the price is right as well.

### ⭐⭐⭐⭐ Great bit, if you have the right router.
*by  on Reviewed in the United States October 21, 2021*

The bit worked great, right until it warped. I have an older craftsman router and the bit would only go in the collet until about 3-4 mm of the shaft below the "insert in router to the line" line was still sticking out . I figured that would be sufficient if I was careful with the amount of pressure I put on the bit. I was wrong. It worked better than any other router I've used, right up until I pushed it too fast (was working with a small oak slab, so that did not help). The shaft warped a bit and developed a distinct vibration, becoming unsafe. I put it in a modern trim router where I could get it to the "insert in router to the line" line and tightening it. The vibration went away, but the bit was then too short to do what I needed. So, if you have an old Craftsman An likely other brands), this bit is not for you. A slightly shorter shank would make this bit MUCH better.

## Frequently Bought Together

- BINSTAK CNC Spoilboard Surfacing Router Bit 1/4" Shank, Slab Flattening Router Bit with 1-3/8" Cutting Diameter, 2+2 Flutes Insert Carbide Wood Planer Router Bits, Planing Bit for Woodworking
- BINSTAK - K1222 -Square Corner 12mm Carbide Inserts 4 Edges (12mm lengthX12mm widthX2.2mm thick-35 Degree Cutting Angle), 10pcs, Countersink Hole, for BINSTAK 1/4" Shank 1-1/4" Cut Dia. CNC Router Bit
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*Product available on Desertcart Vanuatu*
*Store origin: VU*
*Last updated: 2026-06-06*