Rigid Shaft Coupling, 1 Piece Clamp, Inch, Bore Dia. 1/2 in x 3/8 in, 303 Stainless Steel, Finish Bright, Outside Dia. 1 1/8 in, Overall Length 1 3/4 in, Without Keyway, Clearance Dia. 1.328 in, Screw Size #8-32, Max. Torque 275 in-lb, Standards REACH Compliant, RoHS2 Compliant This product contains a chemical that is regulated under California Proposition 65. Warning: This product contains a chemical known to the State of California to cause cancer. -