Application: Designed for high RPM (22, 000) on plunge routers, CNC routers, machining centers and point-to-point machines, #203431, (D) diameter: 35mm, (D) shank: 1/2, overall length (L): 60mm, L1: (30mm), 203431 carbide Tipped hinge boring bit r/H 35mm DIA x 60mm long x 1/2 inch Shank