All Klein block and tackle use high-quality, 3/8-Inch (10 mm) diameter rope. Light, galvanized-steel shell blocks are fitted with snubbing hooks to hold the load. This package features two blocks with an anchor hook with a maximum safe load is 750-pounds (340 kg). Available with a guarded forged anchor hook with the nose lengthened to extend over the latch or keeper. Hooks fit under insulator and engage pin on cross arm. Sheaves are strong yet lightweight aluminum alloy with all-bronze bushings. These are NOT occupational protective hooks. NOT for human support. For more than 160 years, Klein Tools has manufactured premium-quality, professional-grade hand tools that deliver the performance, durability and precision needed to get the job done right. Our family of engineers, workers and craftsman continue to put six generations of expertise into every tool we create by using only the highest quality materials, superior workmanship, and keeping manufacturing as close to home as we can. Klein isn’t just the name of our company, it’s also our family name. And since we’re an American company that’s family-owned and family-run, you know you can count on us to be here tomorrow. Klein Tools doesn’t just make great products, we make great products that stand up to the demands of the professionals who use them every day … Since 1857.