4180 Snatch Block w/ Hook (1/2" wire x 4.5" sheave)4180 Snatch Block with Hook 4. 5" Sheave for 1 2" Wire Rope Designed for reliable load handling, the 4180 Snatch Block features a 4 1 2" sheave and accepts 1 2" wire rope. It offers an 8,000 lb working load limit and a 40,000 lb break strength, backed by a 5: 1 safety factor. A bronze bushing provides smooth sheave rotation and long term durability, even under frequent use in the field. This snatch block includes a hook end fitting with a 1. 38" mouth