CMI micro prusik pulley is essentially a standard micro pulley with wider cheek plates. These plates have a square edge for improved minding. The sideplates swing open to allow placement anywhere on the line. The aluminum cheeks have 7/8" hole for a carabiner. A double lock nut hold everything together on an aluminum axle. The aluminum sheave is 1-1/4" in diameter and held in place by a bronze bushing.