A safety device comprising two straps, the first strap being of a shorter length and a smaller fracture strength, and the second strap being of a longer length and a larger fracture strength, with one end of the first strap and one end of the second strap being adapted to be attached together to a hoisting rope, and the other end of the first strap and the other end of the second strap being adapted to be attached together to a tie back attachment point.