This bifold door hardware set is designed to fit into 48" openings for use with four 1" to 1-3/8" thick door panels weighing up to 30 pounds each. Maximum panel width 11-13/16". Set includes: one pre-finished steel track, one snugger, two roller guides, two upper pivots, six non-mortise hinges, two bottom pivots, two bottom jamb brackets, one set of door aligners, two wood knob pulls, and all necessary screws.