The UFP Torsion Axle Trailing Arm Assembly (Right Hand Side) has a 5 Lug DB-35 10" disc brake assembly with rotor and caliper installed.This assembly uses the The VAULT "Hybrid Lubrication system'' which gives you the ultimate wheel bearing lubrication and protection. No inspection, no maintenance and no service required. The 5/8" torsion arm mounting bolt, nut, and washer are included.Rated Capacity: 3700 lbSpindle Size: 1-3/8" x 1-16" taperedDiameter: 9-3/4"Bolt circle: 5 on 4-1/2"Inner Bearing: 1-3/8" (L68149)Inner Race: L68110 (Included)Outer Bearing: 1-1/16" (L44649)Outer Race: L44610 (Included)Seal: 1.68" ID x 2.56" ODTorque: 150 Lb.