PRE LUBRICATION: The bearings and grease seals are pre-assembled and lubricated with grease. This kit includes all the necessary parts for installation, you can directly install them on the trailer axle. Fits 2,000 lb. axles with 1" straight spindle Complete assembly with bearings, seal, dust cap, cotter pin and lug nuts Measures 4-1/4 inches tall (through center of hub) 2,000 lb capacity - 1/2-20 thread - 5 bolt on 4-1/2 inch bolt circle Read product description below for more information This pre-greased hub has 5-bolt pattern on 4-1/2" circle. Hub assembly includes (2) L-44643 inner and outer bearings, SL-122 double lipped (1.249" I.D.) grease seal, SCP-100 cotter pin, DC-1505 dust cap, (5) STN-506 lug nuts and pressed in bearing races. Pilot diameter 2.5 inches, flange diameter 5.56 inches. PLEASE NOTE: This kit will only fit trailer spindles that have a 1" bearing surface with a 1.25" seal surface. If you have any questions before ordering - call or email us, we can assist if you have a different spindle/seal size. Hub cavity is 2/3 full of high quality Lucas Oil Red N" Tacky Lithium grease.