Check the listing for details. Set of 10 M20 Single Pulley Block with Spring Snap Hook Loading 170lbs. Condition: New. Listed at 38.46 USD. Product Specification: Maximum Loading Capacity: 170lbs(75kg); Single pulley block overall size: 2.9"x1"/73x26mm (H*W); M5 spring snap hook size: 2"x1"x0.2"/50x25x5mm (L*W*H). Package contains 10 pcs single pulley block, 10 pcs spring snap hook.304 Stainless Steel Pulley Roller: The rope pulley wheel and spring are made of durable and sturdy 304 Stainless Steel, which is anti-rust, corrosion resistant, abrasion resistant, strong structure, and high hardness. It can ensure the work is carried out effectively and not easy to fall off.360 Degree Rotation Pulley Block: The hanging wire towing wheel has a swivel top ring, which can facilitate rope handling and provide good rope traverse. It also effectively prevents rope, wire, and cable from knotting.