Specifications:Brand new, high quality, built to performChuck Capacity: 1/32”-1/2”Shank Type: R8TIR: .0024″Drawbar thread: 7/16″-20Max RPM Balanced To: 7000Max Capacity: 1/2″Min Capacity: 1/32″High Precision, Maximum of +/-.001″ RunoutR8 Shank to fit any mill that has the R8 shank.One Piece Integral Shank, no tapers to come apartProduct features:Integral design maximizes rigidity and accuracyIntegral shank design is more compact than a combined drill chuck and drill Chuck arbor, eliminates drill chuck from slipping off its arborOften less expensive than a separate chuck & arborKeyless operationSelf-tighteningBalancedPackage included:1pc Drill Chuck1pc Spanner Wrench UPC Doe.