The double uni knot is a common knot for joining braid to mono or flouro leader …

Double Uni Knot - How to tie a Double Uni Knot | Fishing Knots

These added “No Knot fas-snaps” allow easy changing of jigs or hooks without retying ...

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And when only using a single lower bait, the upper “fas-snap” is a very small profile (as opposed to a loop knot) ...

Rickie