1. Good material: These cutters are made of tungsten carbide steel for high hardness and abrasion resistance.^ 2. Function: The set of cutters can cut cast iron, cast steel, carbon steel, alloy steel, stainless steel, copper, aluminum, marble, jade, bone, etc.^ 3. Usage: Widely used for carving, shaping and removing sharp edges, burrs and excess material.Compatible with most rotary tools, This set of drill bits can be used for engraving, chamfering, grooving , bore, hollow, 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.^ 4. Widely Fit: The 3mm round shank is suitable for many tools with electric or pneumatic motor. There are a total of 10 pieces of strawberries in different shapes that you can use for multiple purposes.^ 5. Portable: The rotary cutters come in a portable case, no need to organize them.The set of rotary cutters can be used to engrave and mill soft wood, plastic and other soft materials, after carving , the surface is smooth.^