Features: Made from high strength aluminum magnesium alloy material, unbreakable and wearable, safe and reliable to use. Using the friction between the rope and the plates to help you climb upwards or downwards safely. With a auto lock gear that offers protection to you to prevent you from falling down when climbing. Suitable for 11-13mm rope, easy to use. Great for outdoor climbing, mountaineering, rock climbing, also suitable for fire rescue, working aloft, etc.