The 1/16" shank carbide burs work perfectly in the high speed engraving tools like the NSK Presto. These long lasting FG (friction grip) burrs measure about 3/4" long are rated to be able to be run up to 500,000 rpm. They work great for cutting on wood, bone, egg shell, soft metals, and other materials. They work great for engraving and where carving the finest details is required.