PEX CinchClamps tool, quick and reliable connections. Ratchet design releases when CinchClamp tab is properly set. Immediate pressure testing to well over 100 P.S.I. 1st time every time connections as tool design eliminates worries of old style copper crimp ring tool jaws and calibration issues. Less expensive than buying 3 separate tools. 1 tool does 3/8" (SKU 452600), 1/2" (SKU 451638), 3/4" (SKU 451674), and 1" (SKU 452058) stainless steel CinchClamp PEX connections. Meets ASTM F2098.