Shaft Collar, System of Measurement Inch, Bore Type Round, Bore Diameter 1 1/2 in, Bore Thread Size Not Applicable, Collar Outside Diameter 2 3/8 in, Inside Height to Flat Not Applicable, Clearance Diameter 2.58 in, Collar Width 9/16 in, Collar Material Stainless Steel, Keyway Width Not Applicable, Collar Material Grade 303, Keyway Depth Not Applicable, Thread Direction Not Applicable, Center to Lever Top Not Applicable, Collar Construction 1-Piece, Screw Material Stainless Steel 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. -