uxcell Tig Gas Lens 5# 10N49 for WP 17 18 26 Series TIG Welding Torch, Pack of 10 Thread: M10; Length: 47mm/1.85 inch Outer Diameter: 18mm/0.71 inch Inner Diameter(Min): 8mm/0.314 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.