Rigid Shaft Coupling, 1 Piece Clamp, Inch, Bore Dia. 1/4 in, Steel, Finish Black Oxide, Outside Dia. 7/8 in, Overall Length 7/8 in, Without Keyway, Clearance Dia. 0.875 in, Screw Size #4-40, Max. Torque 47 in-lb, Max. RPM 4, 000 RPM. This item has been restricted from sale in the following state (s): []