Set includes :  2-1/4" Grease seal (for 5200 lb) (1x) 2-1/8" Grease seal (for 6000 lb) (1x) Bearing 25580 (1x) Bearing CA15123 (1x) Bearing cup 25520 (1x) Bearing cup CA15245 (1x) Grease cap (1x) 1/2"-20 Pressed wheel stud (6x) 1/2"-20 Cone nut - head 13/16" (6x) ...

Pack 1 x 7/16"-20, 4 nuts are required to install 1 backplate, 7" or 10". 

Bolt and Nut 3/8" UNC for 12" electric brakes. The required quantity is 10 sets per axle.