There are multiple knots that work well for suspension rigging. The two most common knots are figure eights and clove hitches. The figure eight knot is probably the most common knot, and is used both for primary and suspension rigging. It is an extremely strong knot, tightens down upon itself and is very easy to untie. The clove hitch is an easily adjustable knot that is often used where the length of the ropes must be adjusted, such as suspensions that require multiple balanced rigging systems.