EASY TO USE: Milled slot makes the tightening easy, thus reducing time and effort while using.STRONG AND DURABLE: Fully hardened spring steel 4 jaw construction makes it a perfect fit for rugged use.PRESSURE RANGE: Comes with diameter of 15 mm with a pressure range up to 3,000 PSI.SMART DESIGN: Narrow coupler design that can be used on fittings with limited access and ball check to prevent backflow of grease.