Shaft Arbor, Fits Shaft Diameter 5/8 in, For Use With Smaller Fractional Horsepower Motors, Includes Hex Nut, Machined Washers, Thread Length 1 13/16 in, Thread Size 1/2 In.-20 LH, Washer Outside Diameter 1 1/2 in, Maximum Wheel Width 1 1/4 in, Setscrew Type Socket, Shaft Rotation Clockwise, Overall Length 3 1/2 in, Type Standard, Application Mounting Various Buffing and Finishing Wheels on Electric Motors