The SR MDP is a lightweight aluminum double pulley that can accommodate 2 ropes up to 11mm each. This pulley can be used to set up a haul system or to tension a line. The curved side plates are designed to allow the pulley to tend a prusik to capture the progress of a rope being hauled through the device.

All Sterling Rope pulleys are constructed from high-strength aluminum side plates and a sealed ball bearing sheave that helps keep out dirt and grit.