This HP diamond bur is a flat end cylinder. The head is 1.2mm in diameter. The head length is 4.0mm. The ISO maximum speed for this diameter bur is 75,000 RPM. Overall length of the bur is 44.5mm (1 3/4"). Shank is 2.35mm (3/32"). Available in a medium grit. Availability: Usually ships in 2-3 business days 1.2mm Flat End Cylinder HP835-012$5.95 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