Petzl Tandem Double PulleyDouble pulley designed for Tyrolean traverses on cable or rope, the TANDEM SPEED has stainless steel sheaves mounted on sealed ball bearings for excellent efficiency. It accepts up to three carabiners to facilitate maneuvers. Aluminum sheaves mounted on self lubricating bushings for efficiency Accepts up to three carabiners to facilitate use Rope compatibility: diameter: 13 mm or less Sheave diameter: 21 mm Ball bearings: no Efficiency: 71 % Maximum
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