Prime Line GD12205 Sectional Door Extension Spring With Cable, 160 lbsHighlights: Includes 1 spring, 1 8'8" safety cable, 1 cable clamp For wood doors 9' W x up to 7" high; 4 panels; 4 sections For wood doors 16' W x up to 7' H; 4 panels; 4 sections For use on sectional, overhead, wood doors 9 ft. W x 7 ft. H, 4 panel 4 section; or wood doors 16 ft. W x 7 ft. H, 4 panel 4 section Use two 160 lb springs for each 9 ft. W 160 lb door (one each side); use four springs for each 16 ft. W 160lb door (2 on each side) 25" x 160