Shaft Arbor Fits Shaft Diameter 1/4 in For Use With Smaller Fractional Horsepower Motors Includes Flanged Washers Hex Nut Thread Length 1 1/8 in Thread Size 3/8 In.-24 RH Washer Outside Diameter 1 1/4 in Maximum Wheel Width 1/2 in Setscrew Type Socket Shaft Rotation Counter Clockwise Overall Length 2 in Type Small Application Mounting Various Buffing and Finishing Wheels on Electric Motors