Exceptional control when starting acceleration, rappelling speed, and deceleration for stopping are the most notable characteristics of the Descent Control 8 Descender. Light weight, tough, and stainless steel wear-resistant surfaces are other important features of this unique descender. The SMC Decent Control 8 performs extremely well in repetitive rappelling environments, such as rescue training or at climbing gyms.Designed for use on rope 1/2'' and smaller, the wider ''shoulders'' help to prevent formation of a girth hitch when the rappeller's weight is off the rope.