What is the diameter of the shaft? Will it fit in a standard pin vise?

Diameter of the shaft is 1/8" or .125

Can I put these in a dremel tool?

Absolutely, but you have to remember these are extremely brittle. ANY side force will break the bit. You are best served using them in some sort of press but with very steady hands and a thoughtful method, operating by hand is possible.

can these be use by hand twisting on brass jets in carburetors to enlarge the one increiment at a time?

I'm going to say yes. I twist them by hand, but I should also mention that I'm drilling into wood. I build model ships. Drilling into brass might be possible, but be aware that these bits, although very effective drilling into wood, are very brittle. I can't tell you how many have snapped on me when I least suspect it and I have to break out another set. I've learned to drill carefully and with patience. Other than that, I do like these bits and have started using them in my Dremel.

Are these recommended for drilling into raw semi-precious stones (like Crystal Quartz, amethyst, agate etc) for the purpose of creating pendant holes?

No. You really need a diamond bit or hole saw, depending on the size. You'll also want to have a water drip going or at least use some sort of lubricant such as beeswax or gem lube.

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50pcs PCB Drill Bits Set Spiral Flute Carbide 0.3mm-1.2mm for Print Circuit Board Stone Dremel Jewelry CNC Engraving (5PCS Each)

Product ID: 136244978

Details

Brand
WayinTop
Cutting Diameter
1.2
Finish Type
Steel
Material
Tungsten Steel
Shank Type
Straight

🌀Spiral flute for smooth drilling

🔩Tungsten steel ultra-durable

⚙️50pcs multi-size precision set

VT6113

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Description

🛠️ Drill Like a Pro, Every Time – Because Precision Can’t Wait!

BUILT TO LAST - Crafted from tungsten steel for unmatched hardness and wear resistance.
COMPACT READY TO GO - Organized in a durable plastic case for easy storage and on-the-go projects.
EFFORTLESS PERFORMANCE - Sharp cutting edges and spiral flutes ensure clean, chip-free holes every time.
PRECISION IN EVERY DRILL - 10 sizes from 0.3mm to 1.2mm, 5 pieces each for flawless micro drilling.
VERSATILE CRAFTING POWER - Perfect for PCB, CNC engraving, jewelry, 3D printer nozzle cleaning, and more.

This 50-piece PCB drill bit set features high-quality tungsten steel bits in 10 precise sizes (0.3mm to 1.2mm), each with 5 spares. Designed with sharp, spiral flutes for smooth, chip-free drilling, it’s ideal for circuit boards, CNC engraving, jewelry making, and 3D printer maintenance. Packaged in a sturdy plastic case, it offers durability, portability, and professional-grade performance for meticulous millennial makers and managers alike.

Specifications

ASIN	B07S636JHY
Best Sellers Rank	#21,665 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #4 in Circuit Board Drill Bits #442 in Drill Bits
Brand Name	WayinTop
Customer Reviews	4.4 4.4 out of 5 stars (1,801)
Cutting Diameter	1.2 Millimeters
Finish Types	Steel
Item Dimensions	3.94 x 1.97 x 0.2 inches
Item Weight	185 Grams
Manufacturer	WayinTop
Material Type	Tungsten Steel
Minimum Bore Diameter	0.3 Millimeters
Model	WYTP21
Number of Flutes	3
Number of Pieces	50
Part Number	WYTP21
Point Style	Spear Point
Set Name	PCB Drill Bits Set
Shank Type	Straight
Surface Recommendation	Steel,Stone
Tool Flute Type	Spiral
UPC	713871273991 713871270419
Unit Count	50.0 Count

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VT6113

Duties & taxes included

In stock

Sold byAmazon VanuatuDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Vanuatu.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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