Rigid Shaft Coupling, 1 Piece Clamp, Inch, Bore Dia. 1/2 in, Steel, Finish Black Oxide, Outside Dia. 1 3/8 in, Overall Length 1 3/8 in, Without Keyway, Clearance Dia. 1.375 in, Screw Size #8-32, Max. Torque 450 in-lb, Max. RPM 4, 000 RPM. This item has been restricted from sale in the following state (s): []