For door panels 1-1/8" thick, 36" width, 400 pound wt. capacity. Heavy duty extruded aluminum I-beam track, nylon wheelball-bearing hangers. Heavy gauge steel components are zinc plated. Set includes: (1) - 200 Track length, (2) 2020 hanger, (1) 1550 door guide, and (1) 1513 door stop.