Block & Tackle are NOT occupational protective hooks and NOT for human support. The light, galvanised-steel shell blocks are fitted with snubbing hooks to hold the load and the sheaves are made of strong yet lightweight aluminium alloy with all-bronze bushings. They are available with standard snap hooks or guarded snap hooks (with snap hook nose lengthened to extend over the latch or keeper). Your choice of forged hook No. 258 or swivel hook No. 259. The hooks fit under insulator and engage pin on cross-arm. All Klein block and tackle use high-quality, 1cm diameter rope. Catalogue numbers followed by SR have rope spliced to block.