Description:Specification: 11.3cm*11cm*9.5cm1.3 insurance device2.Ensure that the rope does not deviate from the self-locking device3.Device can be installed 16-20MM in diameter.4.Lock the rope， fixation， climbing high altitude operation.Material: stainless steel (magnets)Product useThis product is suitable for high-altitude operations， equipment installation and repair work， wall， mountain climbing protection operationPackage Include:1*Stainless Steel Carabiner - Self Locking