"These are NOT occupational protective hooks. NOT for human support.
Light, galvanized-steel shell blocks are fitted with snubbing hooks to hold the load.
Sheaves are strong yet lightweight aluminum alloy with all-bronze bushings.
Available with standard snap hooks or guarded snap hooks (with snap hook nose lengthened to extend over the latch or keeper).
Choice of forged hook Cat. No. 258 or swivel hook Cat. No. 259.
All Klein block and tackle use high-quality, 3/8'' (10 mm) diameter rope.
25 ft (7.62 m) rope length.
Maximum safe load is 750 lbs. (340 kg)."