This is a replacement caliper mounting bracket for Kodiak slip on 10 inch rotors. The bracket will only work with the slip on rotors for Kodiak brake system, and will attach to the 4 hole mounting plate on your 3,500lb axle. This is Kodiaks part number CMB-10-U-DAC. The brackets are dacromet coated to help prevent rust. The bracket will work on either the left hand or right hand side of the trailer. Kodiak offers a 3 year warranty on all of their dacromet coated parts. Remounting these Caliper Brackets requires (4) Bolts that we have as an Add On to this item. Just click the checkbox next to the ones you want and they will be added to your cart.