Shaft Collar System of Measurement Metric with Inch Bore Bore Type Round Bore Diameter 3/8 in Bore Thread Size Not Applicable Collar Outside Diameter 24 mm Inside Height to Flat Not Applicable Clearance Diameter 26.3 mm Collar Width 9 mm Collar Material Carbon Steel Keyway Width Not Applicable Collar Material Grade 1215 Keyway Depth Not Applicable Thread Direction Not Applicable Center to Lever Top Not Applicable Collar Construction 2-Piece Screw Material Alloy Steel