American snaps should be used to attach leads to a trace, used when making up your own tube booms. They should not be used to attach your trace / rig to your main line as they are not strong enough for this and can straighten out under pressure which could cost you a fish of a life time.
To attack mainline to rig in the boat always use AMERICAN SNAP LOCK SWIVELS. See this section for these swivels also.
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