About this itemMeet ASTM F1807 Standard, compatible with 1/2-inch and 3/4-inch copper rings in PEX pipe connections.Convertible jaws improve maneuverability in narrow spaces. You can convert the upper and lower positions of the 1/2"" and 3/4"" jaws at will.Constructed of durable steel, ensuring integrated mechanical properties.Well-polished jaws ensure no damage to the copper rings, preventing leaks. The calibration function supports an extended service life.Stand the innovative hook on the handle up and pre-pressurize the copper ring to prevent it from slipping. The crimper also saves deformed copper rings, but it only operates in the lower jaws near the support hook.