About this itemCapability: IWS-1234P PEX Crimp Tool Kit works with 2 sizes of PEX tubing-1/2-inch and 3/4-inch. Compatible with all types of PEX copper crimp rings and crimp style PEX fittingsCompatibility: Copper crimp rings made to ASTM F1807 standard (Sioux Chief, Watts, Nibco and other brands).Brass or Poly(PPSU) crimp style PEX fittings (F1807/F877 or F2159 standards respectively). All types and brands of PEX tubing - Everhot, Viega, Nibco, Watts, etc.Users Manual Included: Contains information on how to make a crimp connection, check connections with Go-No-Go gauge and calibrate the toolCalibration & Inspection: Tool calibrations are made easy with adjustable lock screws. The Crimp/Clamp Tools must be checked for correct adjustment at the start of every use. Each clamp ring shall be gauged to ensure that it has been crimped properly and for the accuracy of the toolInnovation: Tool includes a gadget helps to reshape the deformed 3/4” rings and cinch rings a little bit smaller to avoid rings from slipping off the pipe surface when crimping. Well polished built-in dual jaw has no loose components ensures perfect crimps everytime and makes no damages on crimp rings