Self-centering steel roller system. Excellent for string loops. Jaws open by depressing the trigger, close by letting up on the trigger. Length adjustment system has 32 different positions extending over 1", no tools required. Fits any size left or right hand. Quick, easy trigger adjustment. Ultra high strength, heat-treated jaws. Rotates 360deg. behind the trigger. Buckle closure for exact fit. Tested on bows up to 200 lbs. of draw weight.