Rigid Shaft Coupling One Piece Clamp Type With Keyway Bore Dia 1-1/2 in x 1 In. Overall Length 2-15/16 In. Outside Dia 2-15/16 In. Clearance Dia (In.) 2-15/16 Screw Size (In.) 5/16-24 x 1 Keyway Width (In.) 3/8 Max Torque (In.-Lbs.) 2660 Max RPM 4000 Stainless Steel Material