Oetiker brand 1" Stainless Steel Clamps are for use with a PEX Clamp (Cinch) Tool, 1" PEX tubing and 1" crimp style PEX fittings.
All Oetiker PEX clamps are manufactured in accordance with ASTM standard F2098 for PEX stainless steel clamps. They are made in the USA and are NSF certified.