This listing is for Kodiaks Dacromet Coated 13" Slip On Disc Brake Kit for 7,000lb Capacity Trailers axles. This Kodiak Disc Brake Kit mounts to your trailers standard 5 Hole Brake Flange. This particular kit includes the required 8 Lug Galvanized Idler Hubs to mount to your trailers spindle. These Hubs mount on the standard #42 spindle that measures 1 3/4" x 1 1/4". The Lug Pattern on the 8 Lug Hubs is 8 on 6 1/2 , an industry standard using 1/2 inch studs. This kit includes the Hubs with pre-installed races. Bearings and Grease Seals are also included to successfully mount to your trailers axle.