Hubs have a 5-bolt pattern on 4-1/2" circle. Hub assembly includes (4) L-44649 inner and outer bearings, (2) SL-150-1 double lipped (1.50" I.D) AND (2) SL-122 1.25" I.D. grease seals, (2) SCP-100 cotter pins, (10) STN-506 lug nuts and pressed in bearing races. Pilot diameter 2.5 inches, flange diameter 5.56 inches.Also included is (2) chrome 1.980" bearing protectors (with bras) provide protection against damage from water and dirt entering the wheel bearings and make lubricating bearings a snap. Bearing protectors prevent wheel bearing failure on boat, snowmobile, ATV, horse, RV and utility trailers. Proven in use for over 35 years and billions of miles of service! PLEASE NOTE: This kit will only fit trailer axle spindles that have a 1-1/16" bearing surface. This kit provides grease seals to work with axles that have 1.25" OR 1.50" seal surfaces. If you have any questions before ordering - call or email us, we can assist if you have a different spindle/seal size.