Shaft Collar, System of Measurement Metric, Bore Type Round, Bore Diameter 7 mm, Bore Thread Size Not Applicable, Collar Outside Diameter 18 mm, Inside Height to Flat Not Applicable, Clearance Diameter 22.4 mm, Collar Width 9 mm, Collar Material Plastic, Keyway Width Not Applicable, Collar Material Grade Acetal, Keyway Depth Not Applicable, Thread Direction Not Applicable, Center to Lever Top Not Applicable, Collar Construction 1-Piece, Screw Material Stainless Steel