Shaft Collar System of Measurement Metric Bore Type Round Bore Diameter 10 mm Bore Thread Size Not Applicable Inside Height to Flat Not Applicable Clearance Diameter 32.3 mm Collar Width 8 mm Collar Material Aluminum Keyway Width Not Applicable Collar Material Grade 2024 Keyway Depth Not Applicable Thread Direction Not Applicable Center to Lever Top Not Applicable Screw Material Alloy Steel Screw Material Finish Black Oxide Resistance Properties Not Applicable