This friction grip diamond bur is a double inverted cone or hourglass shape. The head is 1.0mm in diameter at its widest point. The head length is 2.0mm. 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 19mm (3/4"). Shank is 1.6mm (1/16"). Available in a medium grit. Availability: Usually ships in 2-3 business days 1.0mm Hourglass M7$3.45 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