You will need this in order to mount FUPA12 , BBW, MK14 , 8PRO and other GAS lens mount  Cups on to a #17 , #18  or #26 torch , This kit Includes an American made Gas lens, 3/32-2.4 mm wedge style collet and insulator needed to mount on your torch. Some torches will require you keep your stock insulator. This kit allows you to go into the AC/DC cups section and pick out Gas lens mount smaller cups in example  53N61S  #8 ceramic 10 pack