Libra Trailer 5 on 4.5" B.C. Hub Drum Kits with 10" x2-1/4 Electric Brakes for 3500 Lbs Axle 2 x trailer 5 on 4.5" hub drum kits + 2 x 10"x2-1/4" electric brakes for Dexter and other brands 3,500 lbs trailer axle Drum Bolt pattern: 5 on 4.5", bearing races and 1/2"-20 studs installed Kits also includ: 2x L68149 inner cone bearings and 2x L44649 outer cone bearings, 2x Grease seals 1.719" x 2.565", 2x E Z lube grease caps with rubber plug; 10 cone wheel nuts 1/2"-20 thread Also include: one left + one right 10"x2-1/4" electric brakes with 3" center bore and 4" mounting bolts circle diamter Ref part #. 008-247-05, 84546