Know your knots! Learn to tie a constrictor knot with this free video guide. A constrictor knot is perfect for binding two pieces of rope or two objects together. The knot is easy to tie provided, of course, you know how to go about making it. For an easy-to-follow, step-by-step overview of how to tie this useful binding knot in a minute's time or less, watch this free video knot tyer's guide.