Product Description: Greenfield SKYWinch For Up to 1/2" Rope The revolutionary SKYWinch is different than traditional winches because it has no straps or cables to get tangled and no spinning crank arms to injure you, it eliminates the hassles and dangers of trailering. Simply leave a bow-line attached to your boat and walk it to your trailer without wading in. Then just place rope into SKYWinch, pull tight, and start cranking. The Patented wheel grips the rope and easily pulls most lighter-weight boats under 18'. The crank arm will not spin backwards until released with trigger for controlled payout. Accepts ropes to 1/2" diameter and fits most standard trailers with included mounting bracket & hardware. For best results, use with 1/2" solid-braid rope with break-strength rating that exceeds boat weight.