MICRO 100 QBB-4901000 QC Boring Bar, Bore Dia. .490 , D 1.000. More details: Quick Change Boring Bar, C2 Micrograin Carbide, Overall Length 2.500 In, Bore Dia. .490 In, Bore Depth 1.000 In, Shank Dia. .5000 In, Angle .123 In, Radius .005 In, UnCoated Finish, Right Hand Cutting Direction, Application For Boring