Superior Tool Pex Pocket Crimper, Includes Go/No Go Gauge, Pex Crimper & Convenient Holding Pouch, Crimp Standard Pex Copper Rings Using Your Own 10" Vise Grips, Fits All Common Sizes: 3/8" 1/2" & 3/4", Solid Hardened Alloy Steel, No Adjustments Necessary, Meets ASTM F1807 Spec For Crimping Pex, Lifetime Guarantee.