16 pieces of collet with different specification can be used to weld different studs, meeting your different needs. 2Ergonomically designed handle fits the palm, comfortable to grasp. 3Adopt high quality materials to extend service life. 4Welding nozzle is made of heat resisting materials. 5Mainly used for the welding of metallic materials such as aluminum, brass, copper, steel, etc. Description: Stud welding is the method of welding metal studs or other fasteners on the workpiece. There are many ways to achieve stud welding, and this product adopts energy storage/capacitor discharge stud welding. Features: 1. 6 pieces of collet with different specification can be used to weld different studs, meeting your different needs.2. Ergonomically designed handle fits the palm, comfortable to grasp. 3. Adopt high quality materials to extend service life. 4. Welding nozzle is made of heat resisting materials. 5. Mainly used for the welding of metallic materials such as aluminum, brass, copper, steel, etc. Specifications: Color: black Welding nozzle model 123 Gun body length: Approx. 21cm / 8.27in Welding thickness: Approx. 10mm/0.39in Trachea interface diameter: Approx. 10mm/0.39in Weight: Approx. 1010g Package Includes: 1 x Stud Welding Gun 6 x Collet 1 xConnecting Tube1 x Air Tube1 x Screwdriver Note: Please allow small deviation due to manual measurement. Thanks for your understanding.