Carter Evolution 20 Release. This 3 finger release uses one spring and has an adjustable hold weight of 8-40 lbs. To close the jaw push down on the hasp until it snaps into the closed position and the release is reset. Weighs 3.2 oz. Specifications for Carter Evolution 20 Release: Manufacturer: Carter Color: As Supplied By Vendor Age Group: Adults Features of Carter Evolution 20 Release: Weight range of 8 lbs - 40 lbs Precise micro-adjustments Release firees when you increase resistance Lightweight at 3.2 oz. Package Contents: Carter Evolution 20 Release