This friction grip diamond bur is a ultrafine Xmas tree shape. The head is 0.8mm in diameter at its widest point. The head length is 4.0mm. 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 18mm (3/4"). The shank is 1.6mm (1/16") in diameter. Availability: Usually ships in 2-3 business days 0.8mm Xmas Tree E0.5UF$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