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Hub has 4-bolt pattern on 4" 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, (4) 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.