The duncan loop (also called grinner knot) is a great knot for attaching flies or fishing lures to your monofilament or fluorocarbon line when you want more movement. The loop this knot creates really helps the hook or lure move freely and act more natural in the water. This is also a very strong knot.

Difficulty: Medium
Time: Fast
Strength: High
Usefulness: Attaching lures or flies to your line with a loop.

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