[Material] Anodized light alloy Swing side plates and pulleys for easy and rapid rope installation and removal! Net Weight:0.6 Ib(270g); Dimensions:3.2"W(8.3 cm) * 4.2"L(10.7 cm),package:2PCS. [Single Pulley] Breaking Strength:30kN / 6746 lb for high durability to satisfied your requirements. [Applicable Rope] Suitable for most of ropes with max diameter up to 16mm/0.6 inch, which can be used for emergency rescue, hauling, downhilling, ect. [Hollow Hanging Design] The contact surface between the rope and the pulley is oval, which will not cause great wear to the rope, and also makes the force more uniform. [Widely Use] Rock climbing pulley for mountaining, emergency rescue, hauling or any other activities which needs pulley system. If you need to haul heavy objects, a large pulley is a better choice as it will save you more effort.