Oetiker brand 5/8" Stainless Steel Clamps are for use with a PEX Clamp (Cinch) Tool, 5/8" PEX tubing and 5/8" crimp style PEX fittings.
All Oetiker PEX clamps are manufactured in accordance with ASTM standard F2098 for PEX stainless steel clamps, made in the USA and are NSF certified.