High Quality: The rotary drill bit set is made of high quality tungsten steel, processing hardness up to HRA 85, perfect compatible iron, steel, carbon steel, alloy steel, stainless steel , copper, aluminum, etc. Compatible with most rotary tools like Dremel, Proxxon, Mister Tool, Einhell and similar machines. Shaft diameter: 3mm. Cutting edge diameter: 6mm. Total length: 43.5 to 50 mm. MULTI-PURPOSE: This drill bit set can be used compatible engraving, chamfering, grooving, reaming, hollowing, etc. The processing efficiency is ten times higher than the manual file tool, and almost ten times higher than the small grinding wheel with the handle. Wide Application: The rotary cutter set can be used compatible engraving and milling soft wood, plastic and other soft materials, after carving, the surface is smooth. Portable: The rotary cutters come in a portable case, no need to organize them. 10 Pack Tungsten Carbide Rotary Burrs - Grinding Head compatible Dremel Rotary Tools Features: Material: Tungsten Steel. Shaft: 3mm. Head: 6mm. Total length: (43.5~50)mm. Quantity: 10 pieces. Package size: 5.8 x 9.9 x 1.5 cm.