Motion Control Coupling, Shaft Locking Type – Couplings 1 Piece Clamp, Bore Dia. 5/16 in x 5/16 in, Rated Torque 50 in-lb, Max. RPM 10,000 RPM, Outside Dia. 1 in, Overall Length 1.375 in, Material – Couplings Aluminum, Length through Bore 0.688 in, Screw Type Cap Screw, Screw Size M3, Max. Temp. 200 Degrees F, Finish Anodized Aluminum, Disc Type Stainless Steel, Size –