Single Line Scrap Grapples Application: Hawco single line scrap grapples can be used on any crane equipped with a single lifting hook. These grapples are automatic trip (touch down) type and are equipped with manual trip mechanism as a back-up. This type of grapple is primarily used on ship's cranes to unload prepared scrap iron from ships. Sizes: 1 to 6 cubic yards Standard Features: All alloy steel construction. Pins and bushings made of heat treated 4140 and 4150 alloy stock All pins and bushings are lubricated through recessed grease fittings. Sheaves are cast of alloy steel and fitted with 9C aluminum bronze bushings. Oversized guide rollers for less cable wear. Hydraulic dampening to shock-loading to crane.