Indusco Steel Snatch Block with Swivel Shackle features steel shell for wire rope. Semi-circular guard in shell over sheave prevents wire from slipping between shell and sheave. This feature greatly strengthens the plates in the shell. Steel sleeve over center pin gives a bearing surface of large diameter. Sleeve of this steel hook is held tightly between the plates and makes the block extremely rigid. Failure to design and use block and tackle systems properly may cause a load to slip or fall. The result could be serious injury or death. A potential hazard exists when lifting or dragging heavy load with tackle block assemblies. 4-1/2 tons working load limit A tackle block system should be rigged by a qualified person. Instruct workers to keep hands and body away from block sheaves and swivels and away from pinch points where rope touches block parts or loads. Do not side load tackle blocks.