Twist Locking Carabiner: Length: 8.0cm/3.2″, width: 3.81/1.5″. PANTIK is committed to provide the best quality pulley DIY products. High Quality Silent & Firm Structure: Made of high-quality Nylon, with carbon steel ball bearings inside, The silent bearing earing can greatly reduce the friction of the cable pulley and make the cable pulley rotate smoothly and stably.