The SuperSprings TSS-CTP Contact Plate Kit is for trailers that have the leaf springs offset slightly outside of the frame rail. On these trailers, the Sumo will only make 50% contact with the frame, so the TSS-CTP is designed to mount to the frame and give full contact and support to the SumoSprings. NOTE: One kit per axle. SpecificationsWeight: 6 lbs. Dimensions: 11" x 8" x 5"Application: For Spring-Over Axle Configuration, Trailer SumoSprings for GAWR 5, 000-8, 000 lbs. For spring-over axle configuration SumoSprings with 5, 000-8, 000 lbs. GAWR One kit per axle | Supersprings International Inc SuperSprings TSS-CTP Trailer SumoSprings Contact Plate Kit