About this itemMulti-Head PEX Crimper: IWS-FAS copper ring crimp tool kit includes 3 exchangeable die sets(1/2'', 3/8'', 3/4'') and built-in 1'' jaw, Go/No-Go gauge, PEX cutter. All components fit in a customized carrying casePurpose: IWS-FAS F1807 PEX crimp tool kit is designed to compress copper crimp rings to secure PEX or PE-RT tubing to brass or poly crimp fittingsCapacity: Works with 4 major sizes of PEX tubing - 1/2"", 3/8"", 3/4"" and 1"". Factory calibrated and met ASTM F-1807 standardCompatibility: Copper crimp rings (Sioux Chief, Watts, Nibco and other brands). Brass or Poly crimp style PEX fittings. All types and brands of PEX tubing - Everhot, Viega, Nibco, Watts, Zurn, etcSmooth actuation mechanism allows secure connections with minimal force required. Hardened steel construction ensures reliability and durabilityAdvantages:1.Meet ASTM F1807 Standard with 1/2"",3/4"",3/8"" and 1"" Press Jaws2.Wrench changes jaws and available adjusts crimping force. Short length and light weight, easy to carry and work in tight space3.Ergonomical handle design with comfort grips minimizes user fatigue4.Tool sets used to fasten PEX pipe to brass or poly fittings using copper crimp ring5.Perfect locator and perfect polished press jaws ensure no damage on copper rings and pipes