SharkBite 23251 Plumbing Tool, 1/2-Inch and 3/4-Inch PEX CRIMP RINGS: Time and cost savings in combination with SharkBite PEX Copper Crimp Rings in 1/2 and 3/4 FAST: No waiting for glue to dry or joints to cool USE: Works in conjunction with PEX 1/2 Inch and 3/4 Inch PEX copper crimp rings, PEX Barb Fittings and PEX Pipe Tubing ASSURANCE: PEX Crimp tool does not require calibration and allows each joint to be checked with the included go/no-go gauge tool to verify your connection is secure RESIDENTIAL and COMMERCIAL: All SharkBite products meet the same standards for commercial and residential plumbing applications