Good Material: These cutters are made of tungsten carbide steel for high hardness and abrasion resistance. Working hardness up to HRA 85. Function: The cutter set can cut cast iron, cast steel, carbon steel, alloy steel, stainless steel, copper, aluminum, marble, jade, bone, etc. Uses: Widely used for carving, shaping and removing sharp edges, burrs and excess material. Compatible with most rotary tools. This drill bit set can be used for engraving, chamfering, grooving, drilling, hollowing, etc. The processing efficiency is 10 times higher than manual file tool and almost 10 times higher than small grinding wheel with handle. Wide Angle: 3mm round shank is suitable for many electric or air motor tools. There are a total of 10 pieces of strawberries in different shapes that you can use for different purposes. Portable: The rotary cutters come in a portable case, no need to organize them. The rotary cutter set can be used for engraving and milling soft wood, plastic and other soft materials. After carving, the cutting surface is smooth. Ponint rod shape, round nose cone shape, cut end shape cylinder, spherical nose shape cylinder, spherical shape. Suitable for most DIY jobs such as detailing, cutting, engraving, engraving, repairing and finishing.