The Double Figure-8 Fisherman’s Knot is one of the best knots to use to tie to ropes together for top-roping and rappelling. It’s a very strong knot and, if properly tied, won’t come undone. It’s also a good knot to use if you are tying ropes of unequal diameters together.
The double figure-8 fishermans knot is the best knot to tie 2 ropes together for rappelling and rock climbing.