This CRL Deck Catch for Pass-Thru Windows was primarily developed for use with the Florence Window Assembly. It mounts on the deck and is placed close to the sliding panel so it can act as a guide. It should be positioned so the plunger can push into the sliding panel, locking it in place. Locks into a 9/32" (7 mm) hole drilled in the sliding panel's frame, or can fall behind the frame, which would eliminate drilling.