Climbing rope has never been easier. The Ninja Foot Ascender by Harken Industrial is lightweight and durable. The housing is aluminum and the rope-holding dual cams are stainless steel. Foot ascenders use your body’s largest muscle group to ascend a rope easily and quickly. The Ninja has a maximum working load of 1.5 kN (330 lb) and can handle rope up to 13 mm (1/2"). The Ninja is designed with springs that reduce rope drag to the lowest of any available foot ascender. This means that there is a smoother and easier take off without having to counterweight the rope or reach down to pull the rope through the unit. The result? Increased worker productivity.