This hub assembly fits 2,000 lb axles that are equipped with 1" straight spindles. The hub has 5-bolt pattern on 4-1/2" bolt circle for a 2,000lb axle with hub capacity of 1,250lbs. Includes pressed in bearing races with a pilot diameter 2.5", flange diameter 5.56" and measures 4-1/4" tall (see secondary photo for dimensions). This assembly includes the following parts. (2) L-44643 (1" I.D) Inner and Outer Bearings, (1) SL-122 (1.249" I.D.) Grease Seal, (1) SCP-100 Cotter Pin, (1) EZ Lube Dust Cap, (1) Rubber Plug, (5) STN-506 1/2"-20 Lug Nuts. NOTE: This kit does not include the castle nut. You must use your existing nut for installation.