PEX crimping tool meets ASTM F1807 specification with go/no go gauge to be used with any PEX manufacturer. Crimper fits all common sizes: 3/8 In., 1/2 In., 3/4 In. PEX tubing fittings. Tool is made from solid hardened alloy steel and requires no adjustments or calibration ever. Crimp standard PEX black copper fittings using your own 10 In. vice grips. Makes installing PEX portable and versatile without the huge multi tool investment. Also comes with portable tool pouch and a lifetime guarantee.