The Kong Twin Block Roll Double Sheave Aluminum Pulley is a heavy-duty product made from high-quality aluminum alloy. The double pulley wheels are placed between the two mobile side plates. The use of low-friction ball bearing ensures a smooth action of the pulley wheels that can easily accommodate ropes with a diameter up to 12 mm. The integrated rope clamp in this pulley curtails the need of traditional pulley/rope clamp set-up.