there are these with a center lever for locks: http://www.amazon.com/Nite-Ize-Locke.../dp/B00FIX12AG
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I used the very small NiteIze metal s-biner initially. The size is perfect and gates are easy to work wearing gloves, and are plenty strong, but they lack a recess for the bail to sit in when the biner is closed and the Zingit finds a way to wiggle under the bail once under tension, and ultimately pops out..
I know they make the locking s-biner, but rather than try, and try different solutions it was easier to just go Dutch. Buy once, Cry once, and be done with it.
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