Yes. I've used them in multiple RTAs, kayfun 4 (28g kanthal / 36g nichrome80, 2.5mm ID), lemo 2 (26g nichrome80/36g nichrome80, 3mm ID), done dual claptons in my Cthulhu (Those were 26g kanthal/36g nichrome80), 2.4mm ID IIRC super tight fit). Those are a couple I remember off hand working pretty well.