This is a great disc brake set manufactured by Kodiak. This is one of their 5 bolt 3,500lb capacity integral disc brake kits. This particular brake kit has Dacromet coated hubs, rotors, calipers and brackets. This is Kodiaks part # 2/HRCM-10-DAC. This kit is designed to fit on 3,500lb capacity axles using the standard 4 bolt brake flange. This is Kodiak's Integral set which means the hub and rotor are cast together as one piece. This means that the hub and rotor are machined together which minimizes rotor runout and provides a smoother ride. The hub is a 5 on 4 ½” bolt pattern. This trailer disc brake kit will fit with 13” or larger wheels. What's included: This kit includes (2) Dacromet coated 10” hub and vented rotors that are cast as one piece. The vented rotors help dissipate heat quickly. Also included are (2) Dacromet coated caliper mounting brackets. The calipers are Dacromet Coated except for the brass fittings where your brake lines run in. The brake pads are red steel backed. The calipers ride on (4) stainless steel caliper mounting bolts.