MICRO 100 QBB-100300 QC Boring Bar, Bore Dia. .100 , D .300. More details: Quick Change Boring Bar, C2 Micrograin Carbide, Overall Length 1.500 In, Bore Dia. .100 In, Bore Depth .300 In, Shank Dia. .1875 In, Angle .025 In, UnCoated Finish, Right Hand Cutting Direction, Application For Boring