This friction grip diamond bur is a ultrafine round ball. The head is 0.7mm in diameter. The ISO maximum speed for this diameter bur 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"). The shank is 1.6mm (1/16") in diameter. Availability: Usually ships in 2-3 business days 0.7mm Round Ball A0.5UF$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