Rigid Shaft Coupling, 1 Piece Clamp, Inch, Bore Dia. 1/2 In. x 5/8 In., Stainless Steel, Finish Plain, Outside Dia. 1-9/16 In., Overall Length 1-9/16 In., Without Keyway, Clearance Dia. 1.563 In., Screw Size #10-32, Max. Torque 380 in.-lb., Max. RPM 4000