Before installation of John Sterling BK-1134 or BK-1135 bulk fixed guards, use this locking channel to convert the John Sterling fixed windowguards to swing open, escape window guards with a padlock hole. Use one channel with each unit of John SterlingBK-1134 (no window guards are included, this is just the locking channel), BK-1134L (not included), BK 1134-S(not included) and BK 1135(not included) off-white window guards . Use one locking channel per window guard (not included). Each locking channel has a padlock hole to use for either a safety release pin (not included) or a padlock (not included). Note: No window guards are included. This is a locking channel only.