Frame mount coil spring bases. Designed for mounting coil springs to the inside or outside of flat frame surfaces. Can be mounted legs up or legs down. Cut from 1/4" thick steel with 3.0" legs, 6.0" maximum coil diameter, and 1/2" bolt hole. Can be used with optional S110 coil spring retainers (shown in picture left). Frame mount coil spring bases are sold as a pair, unpainted.