Advantage of Transparent Disc:* It gives the welders extrodinary visibility and comfortable feeling when welding work.* Specially designed to help weld precision and fine work where it requires to see the location very clearly.* It helps to achieve a uniform flow of welding gas which can help in welding.* It can also help to save at least 30% gas compared to ordinary ceramic protection cup.* They are widely compatible with original popular TIG torch spare parts. In this case,* A) As for #10 transparent shield cup for torch WP9/20/25/24, you need to buy one extra o-ring to complete the whole spare parts on the basis of the original other spare parts.* B) As for the #12 big or small transparent shield cup for WP17/26/18 torch, you need to buy one extra ring to complete the whole spare parts on the base of the original other spare parts.* It has longevity than other ceramic shield cups, because there is not too much u with heat. Specification: Material: Plastic, Metal, Glass Pyrex Glass Cup (ID): About 15*19.7mm Stubby Gas Lens: About 2.4mm Easy to assemble and use. and practical. Widely used together with our Fortuneweld brand precision cold welder PVC220. Fits all WP-9/20/25 air-cooled welding torches.Package Included:1 x #12 Glass Pyrex Cup1 x 45Vxx Collets Body Gas Lens for Tig Torch Welding1 x 13Nxx collet for Tig Torch Welding4 x O-RingsNote:1. The actual colors of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness.2. Please allow slight manual measurement deviation for the data.