Features: Using high class ceramic material of good quality, have strong resistance of high temperature. Easy to install without other special requirements, making the welding cup convenient to use. Alumina ceramic welding cup is sturdy and durable, which possess a long service life. This welding torch accessories set is suitable for WP9/20/17/18/26 series welding guns, useful and practical, easy to install and convenient to use. Adopt excellent craftsmanship to bring small exquisite shape, easy to carry and store. Specification: Material:Ceramics Front Outer Diameter:Approx.20mm/0.78inch Rear Outer Diameter:Approx.24mm/0.94inch Rear Inner Diameter:Approx.18.9mm/0.74inch Height:Approx.25.5mm/1inch Diameter of 2.5 mm 2.4mm aperture Package Includes (10# 12# 14# 16# 24# Choose what you need): 1/2 PCS x Ceramic Nozzle note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.