Ridgid 43853 1/2-Inch ASTM F 1807 Close Quarters Manual PEX Crimp Tool Over 20% lighter than other traditional-style crimp tools, these tools feature E3 ergonomic handles and come standard with a go/NO-GO gauge. With handle openings up to 71% smaller than traditional PEX crimp tools, you can maneuver into tight spaces with ease. For use with ASTM F1807 black copper crimp rings and insert fittings for PEX tubing. Up to 33% less force required to produce a crimp, compared to traditional PEX crimp tools. Used with ASTM F1807 copper crimp ring PEX tubing connections Durable, Glass-Filled Polycarbonate E3 Handles (Expert Engineered Ergonomics) provide increased comfort Easily adjustable cam for tool calibration Integrated Go/No-Go Gauge folds into handle for easy storage Handle openings up to 71% smaller than traditional PEX Crimp Tools