Pexflow R1245 PEX Crimp Tool - with Lock Hook Compatible with all Oetiker Style Cinch Clamps Durable High Grade Steel Construction Lightweight Design(Color may vary) UNIVERSAL TOOL: This cinch tool works with stainless steel clamps of sizes 3/8", 1/2", 5/8", 3/4" and 1" AUTO RELEASE: Ratchet design releases when the Cinch Clamp tab is properly pinched FOR ALL CLAMPS: Works with Nibco, Watts, Zurn and all Oetiker Style Clamps QUALITY: Made of High Grade Steel DETAILED INSTRUCTIONS : Check the detailed instructions on the packaging (as seen in the images)