Length: 3.5; ISO 544/031; Recommended Speed: Less than 160,000 RPMRobot FG Diamonds are rated #1 in overall performance by a National Research organization. The robotic manufacturing process distributes precise amounts of natural diamond particles onto a one-piece, stainless steel shank. Made by high technology robots in a computer-automated environment Multi-coating technique with special surface treatment for durability – maintains cutting efficiency with less clogging Smooth cutting and long-lasting performance Grits diamonds are available in Super Fine (SF), Fine (F), Standard (R), Coarse (C), and Super Coarse (SC) Use Robot FG Diamonds for cavity and crown preparation