This is a replacement Dacromet coated integral hub and rotor manufactured by Sturdy Built Trailer Parts. This integral hub and rotor fits boat trailer disc brake kits made by Study Built, Kodiak, and Deemaxx. The hub and rotor are cast together as one piece. The hub and rotor are designed to fit on 3,500-3750lb capacity axles. It uses the common 5 on 4.5 inch bolt pattern and utilizes 1/2-20" thread hub studs. The rotor is vented to help dissipate heat. The hub and rotor use a 1 /16" ID outer bearing (44649) and a 1 3/8" ID inner bearing (68149). The bearings and seals are sold separately and not included with the hub/rotor. The hub and rotor are Dacromet coated to help resist rust. When you are buying your rotors from Sturdy Built you can be certain you are buying a reliable product built to last, as every coated rotor is covered by a 1-year warranty! Replaces the following part numbers: Kodiak: - ROTOR/HUB-10-DAC or R/H-10-D-S Deemaxx: - RTR/HUB-102-MAXX