STURDY MATERIAL: Heavy duty rope hoist pulley system is made of alloy steel material, with high strength, high toughness, wear proof, erosion proof, high and low temperature proof. IMPROVED LIFTING CONVENIENCE: The 8:1 lifting power of the block and hoist system minimize the amount of work required when lifting, allowing you to lift heavier things; And you can do all the work with blocks and tackles without electricity or help.
eBay