Genie C-Channel Screw Extension Kit &ndash; Accommodate an 8&rsquo; High Door, For Use with Genie PowerLift and PowerMax 1200, 1500 Garage Door Openers, Model EKSC ACCOMMODATE AN 8 HIGH DOOR: This C-Channel Screw extension kit is to be used in addition to a 7 (3-piece) screw drive rail to accommodate an 8 high door. FOR USE WITH: Use this screw extension kit on Genie PowerLift and PowerMax 1200 and 1500 garage door openers. INCLUDES: This C-Channel screw extension kit includes rail extension, hardware and instructions. EASY TO INSTALL: With all hardware included, installation is quick and easy. GENIE, THE BRAND YOU TRUST: Genie is one of Americans best known and trusted consumer brand names. Weve been making products you can rely on since 1923.