<https://thebrewhut.com/product/oetiker-clamp-21-0-13-16/#product>
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"Oetiker® Stainless Steel Stepless® Clamps\r\nStepless®... when nothing less than a perfect seal will do.\r\nOetiker No. 21.0\r\nRange Closed-Open: .701 - .827\r\nClamp Index: I\r\n- Manufactured of 304 grade stainless steel for extended durability and increased corrosion resistance\r\n- Stepless® tongue-in-groove design provides uniform pressure and gapless leak-free seal\r\n- All Oetiker® clamps have burr-free edges to protect parts and to prevent injury during assembly\r\n- The clamp ears adjustable crimp range compensates for component tolerances and applied pressure"
<https://thebrewhut.com/product/oetiker-clamp-21-0-13-16/>