Duncan Loop, Uni Knot, Grinner Knot) One of the most important snelling knots, used mainly for attaching hooks, swivels, lures or flies to a line. It can also be used for joining two lines. The knot is very strong and dependable and not complicated in structure: after some practice it can be tied effortlessly in the dark. The knot was named after its inventor, Norman Duncan, but then for its vast scope of application it got another name "Uni knot". Among the multiple virtues of the Duncan knot i