"Four-bolt low speed hub. 3/4in. bore with ball bearings. Zerk grease fitting. For front or free wheeling rear wheel. Fits #1340 thru #1342 rims. Set of two. U.S.A. Application Hub, Outside Diameter in. 3 3/4, Overall Width in. 2 1/2, Bolt Circle in. 2 3/4, Bore Diameter in. 3/4. Outside Bearing to Outside Bearing 2.5in. Use For Free Wheeling Axles"