What kind of boat are we talking about? Lifting bridles like the one pictured are generally for dinghies like Thistles or Lightnings, where they attach to lifting points with two of them aft of the shrouds and the third aft of the centerboard trunk. The ring and wires shown do not look strong enough to lift a Santana 21. For lifting a keelboat - a Soling, for example - we used a two-legged bridle that attached to straps held in place by the keelbolts, amidships. The ring was tied off P/S to keep the boat upright.