High-Quality Alumina Ceramic Cups / Nozzles for TIG Welding Torches Series 17 18 and 26 with Standard Set-UpCompatible with all major brands of TIG Torches Series 17 18 and 26.Available Sizes: #4 (1/4 ) #5 (5/16 ) #6 (3/8 ) #7 (7/16 ) #8 (1/2 ) and #10 (5/8 ) - Available Packages: 5 PACK and 10 PACK. Select your option from the menu.These Cups are used in in 17 18 and 26 Series TIG Torches with Standard Set-Ups. They will NOT fit torches with Gas Lens Large Diameter Gas Lens or Stubby Set-Ups. ***Please make sure your TIG torch is 17 18 or 26 Series with Standard Set-Up. Check all the pictures for sizes and compatible accessories***