100 mm disc = 3.93" diameter. What is the diameter of this disc? Is it under 4" diameter?

Yes, it is a little less than four inches in diameter. On my grinder (a DeWalt), it was a little small for comfortable grinding. It hogs off wood very quickly, but was harder for me to control due to the smaller diameter and interference with the chip shield of the grinder.

Does this spin as fast as the stump grinding blade?

It spins at the speed of the angle grinder you put it on. Same as the stump grinding blade.

Is this considered coarse?

very course. I used this attachment to smooth out wood after a lancelot type tool and before 40 grade sandpaper.

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Wood Carving Disc Grinder Shaping Disc 7/8 Inch Bore Wood Tungsten Carbide Grinding Wheel Carving Abrasive Disc for Sanding Carving Shaping (100mm, Arc Type, Silver)

Wood Carving Disc Grinder Shaping Disc 7/8 Inch Bore Wood Tungsten Carbide Grinding Wheel Carving Abrasive Disc for Sanding Carving Shaping (100mm, Arc Type, Silver)

Product ID: 296841301

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Details

Grit Material
Tungsten
Product Dimensions
4"L x 4"W
Brand
Winbyoan
Compatible Devices
Angle Grinder
Grit Type
Medium

💪Tungsten carbide durability

🔧7/8" to 5/8" adapter

🛠️100mm diameter

Description

🔨 Unleash Your Inner Craftsman!

BUILT TO LAST - Crafted from tungsten carbide for unmatched durability and wear resistance.
TRANSFORM YOUR GRIND - Easily switch between 7/8" and 5/8" with included adapter.
EFFORTLESS EFFICIENCY - Pointed teeth make residue removal a breeze—goodbye, sore hands!
PRECISION PERFORMANCE - 100mm diameter designed for optimal sanding and shaping.
WOODWORKERS BEST FRIEND - Perfect for all your woodworking needs—sanding, carving, and polishing.

The Wood Carving Disc Grinder Shaping Disc is a versatile tool designed for woodworking enthusiasts. With a 100mm diameter and a durable tungsten carbide construction, it fits most standard angle grinders and allows for easy residue removal, making it an essential addition to your toolkit.