Indusco steel snatch block with swivel hook. 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 is held tightly between the plates and makes the block extremely rigid. Failure to design and use tackle block 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 loads with tackle block assemblies. A tackle block system should be rigged by a qualified person as defined by ANSI/ASME B30.9. 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.