Do you mean toggles like you use on standing rigging, usually eye and fork but sometimes fork and fork? Like with clevis and cotter? They are for a given pin size almost always stronger than shackles and given that they are drilled for pins are more suited for the high loads of rigging. But you'd not want to feed anything flexable - wire or fibre - through the eye. So I'm thinking you mean something other than what I know as a toggle.
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