This friction grip diamond bur is a torpedo shape. The head is 0.9mm in diameter at its widest point. The head length is 3.0mm. 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 23mm (3/4"). Shank is 1.6mm (1/16"). Available in a fine or medium grit. Availability: Usually ships in 2-3 business days 0.9mm Torpedo S12$3.45Grit: FineMedium 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