This friction grip diamond bur is ball shaped and is 1.2mm in diameter. The diamond coating extends approximately 1mm down the neck of the bur to provide a diamond coated collar. ISO maximum speed is 450,000 RPM. This diamond bur is made for air powered, high speed dental handpieces. Overall length of the bur is 19mm (3/4"). Shank is 1.6mm (1/16"). Available in a medium or coarse grit. Availability: Usually ships in 2-3 business days 1.2mm FG Round Ball w/Collar #802-012 A1L$3.45Grit: MediumCoarse Thank you for visiting A&M Instruments, Inc. Diamond Dental Burs. You will be pleased with the high quality of your dental burs and dental discs. All of our diamond and carbide cutting tools are made in the US, in Alpharetta, GA. Copyright® 2003-2011 A&M Instruments Inc 770-772-6404