Chmbrln CHAIN DRIVE EXTENSION KITFor use with Power Drive chain drive garage door openers featuring the quick-install rail system.Works on garage doors up to 8 feet high New structural steel rail systemSnap together, no bolts necessaryIncreases structural integrityIncludes rail extension, replacement chain/cable, and all necessary hardwareBoxed.AHO5338363
Item# : SPM5783217001
Model # : 5338363