Petzl B51 Macrocender
A special rope clamp developed for large-diameter rope, the Macrocender is particularly effective as a safety device when ascending or descending fixed ropes. For use on single rope, 1/2" to 3/4" dia.
The cam has a set of shallow, slightly rounded teeth which will provide friction against the rope without damaging the sheath. Spring loaded action is achieved by design to help prevent rope damage under resistance of a small diameter cable attached to the cam. Removable axle can be used to install or remove the rope at any point on the rope. Locking pin reduces the risk of undoing the system accidentally. Breaking strength 6,000 lbf (26.69KN).