Diamond coated rotary carving bits for power tools. These bits all have a 1/8" diameter shank for medium speed power carving tools and rotary tools. These tools are machined from high quality carbon steel, then coated with diamonds using a proprietary multi-layering process. This means faster, smoother cutting and less heat buildup. Maximum RPM varies with the size of the tool. These diamond bits are used in a variety of household and hobby uses. For use in drills, rotary tools or any power carver with a 1/8" collet. Overall length of each bit is 57.15mm (2 1/4") unless noted otherwise.