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 2.63 in, Collar Width 9/16 in, Collar Material Plastic, Collar Material Grade Acetal, Collar Construction 1-Piece, Screw Thread Size 1/4 In.-28