Diamond coated rotary carving burs and diamond drill bits for power carving tools and rotary tools. These bits have a 3/32" diameter shank for medium speed power tools such as Dremel Tools. These bits are machined from surgical quality stainless steel, then diamond coated for an aggressive cut and smooth finish. This means faster, smoother cutting with less heat buildup. Maximum RPM is 5,000-35,000 depending upon head diameter. These diamond bits are used in a variety of household and hobby uses. The 3/32" shank is one of the most commonly used sizes in popular consumer rotary tools and power carving tools including power wood carving tools. Overall length of each bit is 1.751" (44.5mm) unless noted otherwise.