GM CLIMBING UIAA Certified Zipline Pulley Kit Speed Pulley / Trolley with Oval Carabiner Professional Double speed pulley with oval screw gate Carabiner is the most popular as well as basic kit for back yard zipline set-up. Mounted with ball bearing, the double sheaves of pulley provides great smooth rotation and efficient performance, maximum speed rating up to 25m/s. Stainless steel sheaves qualify the pulley compatible with both textile rope and cable. Holes for easily clipping carabiners, flexible enough for you to set your preferred zipline model. The speed pulley is compact and quite convenient to carry or disposed, which makes it popular while it carries out its basic function as a general pulley for hauling or transporting equipment. Best zipline trolley for your backyard zipline set-up Great pulleyfor general purposes, such ashauling, rigging,transporting, etc. Install pulley on the rope or cable with open bottom side Close the open bottom with oval locking carabiner: oval for balance; locking for safety <span class="a-text-bold">AttentionNever clip carabiner over cable or rope. </span>Cable or rope is running under sheaves of pulley, not carabiner.