Dead Ringer Crossbow Cocking Rope is compatible with most popular crossbow brands and styles. It is adjustable for all rail lengths, simply pull the rope through the handle hole and adjust to size. The crossbow cocking aid is designed to reduce draw weight by 50% and is extremely quiet. Cocking rope has smooth roller glide hooks enhance quiet and stealth as opposed to a hand crank handle. Dead Ringer, deadly accurate products made by passionate and fanatical outdoors enthusiasts