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.