IWISS PEX Crimping Tools Cinch Clamp Tools for Fastening Stainless Clamps Sizes from 3/8-Inch-1-inch with Go No-Go Gauge suits All ASTM F2098 and Non-F2098 Ear Hose Clamps Ratchet and self-releasing mechanism ensure a completed crimp Plumbing Tools fits all PEX cinch clamps except for Zurn Quick Clamp Factory adjusted and does not require any additional calibration or adjustment Work with Stainless Steel Clamps of sizes 3/8", 1/2", 5/8", 3/4" and 1" with GO-NO/GO Gauge Comfortable to operate thanks to a rubber coating handle and 20% longer handle, saving 30% work pressure.