The Trident 10" Magnetic Gate Latch is the leading security trusted pool lock. It has an elegant, modern look and biodegradable according to international pool codes (always check your local code before installation). You usually want to attach this magnetic gate latch where the is at least 54" above ground. You will receive 2 keys per latch and the tabs are coded in the same way, so if you buy more than one that will all the keys work. The Gate and The Gate Post must have space if you have another round, the adapter zbga-latchrndadpt-nw for round posts. The Gate GAP is from .375" 1.5" 1" is ideal if you have smaller or larger gate distance, this tab will not work. The Trident is guaranteed up to 1 million cycles, insured build your new flap with confidence.