Rigid Shaft Coupling, Bore Diameter 1 3/8 in, Bore Diameter 2 3/8 in, Bore Type Round Keyed, Clearance Diameter 1.03 in, Coupling Construction One-Piece, Coupling Material Stainless Steel, Coupling Outside Diameter 7/8 in, Different Bore Sizes No, Keyway Depth 1 3/64 in, Keyway Depth 2 3/64 in, Minimum Bore Diameter 3/8 in, Keyway Width 1 3/32 in, Keyway Width 2 3/32 in, Maximum Bore Diameter 3/8 in, Maximum Speed 4,000 RPM, Maximum Torque 145 in-lb, Overall Length 1 3/8 in 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. -