Mortise lock with 100% stainless steel mechanism. This model can be installed on steel, aluminum, or wood gates. The massive stainless steel hook and adjustable latch bolt makes this a one of a kind lock. The combination of the hook (dead bolt) with the SHKM or SHKW keep provides a secure anchoring of your gate while preventing the gate from being pried open as the dead bolt's "hook" locks into the keep's anchoring plate. These locks can be used on metal, wood or aluminum gates or even with our fully prepared profiles. The latch gap required is keep dependent, but the SHKM Hybrid keep requires a 7/8" latch gap.