These disc brake kits are designed to be used as single disc with the "In Line" and "Off-set" exact reproduction old style Springer front forks and consequently also fit in stock Springer forks in 45CI models and 1936 thru 1948 Big Twin. Kits come with 2-piston brake caliper, 8 5/8" (220mm) diameter brake disc, and your choice of chrome or white plated caliper bracket, wheel axle and other hardware. Kits for Star Hub wheels also include a disc to hub adapter.