Chamberlain G8808CB-P 8808CB 8-Foot, Compatible Whisper Drive Plus Models, Includes Replacement Belt Garage Door Opener 8 Ft Rail Extension Kit The product is 8', New Structural Steel Rail Extension Kit Easy and simple use kit The product is manufactured in China For use with Chamberlain Whisper Drive and Whisper Drive Plus belt drive garage door openers featuring the quick-install rail system. Works on garage doors up to 8 feet high Includes rail extension, replacement belt, and all necessary hardware New structural steel rail system Increases structural integrity