We offer this Zinc Plated bolt for the Specific purpose of mounting your Caliper Bracket to your trailers Brake Flange on the standard 5 Hole flange on 5,200lb-6,000lb trailer axles. You would need (5) of these bolts per flange. This bolt accommodates Kodiaks 5,200lb-6,000lb Caliper Mounting Brackets. This listing is for (1) Bolt and also includes (2) Galvanized Flat Washers, (1) Galvanized Lock Washer, and (1) Zinc Plated Hex Nut