CK 6C40 1.0 mm long lasting Reverse tig torch collet, For CK 9, 20 and 230 Tig torch, compatable with WP 9 and 20 tig torch. The longest-lasting collet offered by CK Worldwide is the Reverse collet. This collet lasts longer than both the standard collet and wedge collet combined, due to its position in the torch head. It sits between the collet body and the backcap, keeping it away from the heat at the front end of the torch. It’s very small, easily replaceable, and cost effective. For 2 series tig torches.