The terminal rescue figure 8 descender, it made from high strength aluminum-magnesium alloy material, pass 35KN breaking strength tested. Easy installation ideal for fast use in adverse conditions and easier to handle heavy loads. Suitable for rescue, climbing, training, mountaineering, aerial silk yoga,camping hammock, outdoor heavy duty swing etc. Specifications: Material: aluminum-magnesium alloy(antirust) Maximum Breaking Strength: 35kN /7868lb Recommended Working Load: 3,000lb Size: 17x16.8cm / 6.7x6.6inch Big ring: 5.5cm Weight: 270g / 0.6lb Works On Ropes: 8-13mm / 0.3-0.5inch Please attention: It is necessary to receive adequate knowledge of techniques and security measures training before using the tools. Safety check before use. The ears prevent rope sliding up and locking up, which is always the cause of accidents when rappelling with a standard 8. If you would like to stop during rappelling for other operations, you could make 2~4 loops around the ears and lock yourself up. Pay attention to that the loops must be under and within the ears. Related accessories: https://www..com/dp/B0711B634J