Compact double pulley for block-and-tackle systems. Large connection hole accomodates two carabiners. For ropes up to 13 mm. Prusik minding, the self-locking knot can be installed on both sides and both wheels. Self-lubricated brass bushings are the perfect solution for light applications at low speed. Efficiency: 80%. Aluminum alloy body and wheels, stainless steel axle.