With excellent plasticity, toughness and crack resistance, especially low-temperature impact, toughness higher. Uses: for a variety of locations of the pipeline TIG welding arc welding and arc welding, can be satisfied with the welding joints. Can be welded carbon steel and some low alloy steel. Applicable to WP-17/18/26 series air cooled tig welding torches Torch accessories suitable for TIG-205DS& TIG-250P ACDC welder. Stubby Gas Lens with Pyrex Glass Cup/Stubby Non-Gas Lens with Alumina nozzle available. What's Including 5 pcs #10 Pyrex Glass Cup 1pc #4 Pyrex Glass Cup 1 pc #5 Pyrex Glass Cup 1 pc #6 Pyrex Glass Cup 1 pc #7 Pyrex Glass Cup 1 pc #8 Pyrex Glass Cup 5 pcs Alumina Cup 1 pc #4 13N08 Alumina Cup 1/4"( 6.5mm) 1 pc #5 13N09 Alumina Cup 5/16"  (8.0mm) 1 pc #6 13N10 Alumina Cup 3/8"  (9.50mm) 1 pc #7 13N11 Alumina Cup 7/16" (11.0mm) 1 pc #8 13N12 Alumina Cup 1/2" (12.50mm) 5pcs Gas Lens Alumina Cup 1 pc #4 53N58 Gas Lens Alumina Cup 1/4" (6.5mm ) 1 pc #5 53N59 Gas Lens Alumina Cup 5/16" (8.0mm) 1 pc #6 53N60 Gas Lens Alumina Cup 3/8" (9.50mm) 1 pc #7 53N61 Gas Lens Alumina Cup 7/16" (11.0mm) 1 pc #8 53N61S Gas Lens Alumina Cup 1/2" (12.50mm) 8pcs Collets Body 1 pc 17CB20  Collets Body Stubby Gas Lens 1.0mm 1/25"  1 pc 17CB20 Collets Body Stubby Gas Lens 1.6mm 1/16" 1 pc 17CB20 Collets Body Stubby Gas Lens 2.4mm 3/32" 1 pc 17CB332 Collets Body Stubby Gas Lens  3/32" 1 pc 17GL040 Collets Body 1.0mm 1/25" 1 pc 17GL116 Collets Body 1.6mm 1/16" 1 pc 17GL332 Collets Body 2.4mm 3/32" 1 pc 17GL18 Collets Body 3.2mm 1/8" 20pcs Collets 4 pc 10N22S Collets 1.0mm 1/25" 6 pc 10N23S Collets 1.6mm 1/16" 6 pc 10N24S Collets 2.4mm 3/32" 4 pc 10N25S Collets 3.2mm 1/8" 3pcs Back Caps 1 pc 57Y04 Short Back Cup for Tig Welding Torch 1 pc 57Y03 Medium Back Cup for Tig Welding Torch 1 pc 57Y02 Long Back Cup for Tig Welding Torch 20 pcs Temperature Resistant O-rings（14 green, 6 red） 1pc 17GLG20 Insulator Torch Body Gas Lens 1pc 18CG Cup Insulator Torch Body