uxcell Tig Gas Lens 4# 10N50 for WP 17 18 26 Series TIG Welding Torch, Pack of 2 Thread: M10; Length: 47mm/1.85 inch Outer Diameter: 18mm/0.71 inch Inner Diameter(Min): 6.5mm/0.256 inch Inner Diameter(Max): 11mm/0.43 inch Designed for W17, W18 and W26: The gas lens kit is specially used for W17, W18 and W26 TIG Welding Torch.