4 Different Glue Nozzles Size for your different job requirements (Bore Diameter x Length): 2.0x70mm, 2.0x50mm, 2.0x34mm, 3.0x50mm; Thread Diameter: 7/16 Inch (10.8mm) Small Bore Nozzle - Small glue amount, for accurate crafts or small projects. Long Tube Nozzle - Average glue amount, for hard-to-reach areas. All copper nozzles have a built-in leakproof steel ball and waterproof rubber o-ring to prevent glue from leaking, improve work efficiency. (10.8mm) 7/16 Inch thread diameter fits for most hot glue on the market, perfect DIY accessories for decorate toys, artistic flowers, home repairs, DIY craft projects, . Made of pure copper material with excellent thermal conductivity enable smooth and constant glue flow, durable and wear-resisting for long lie use. Includes 4 Pcs copper hot melting glue nozzles (Small Bore & Long Tube) for various repair and craft projects. Copper nozzle works much aluminium nozzle, it has great performance on durability and heat conduction. Built-in leakproof steel ball, no matter in pre-heating process, in use or after use, there will be no glue leakage from the nozzle. Made of pure copper material, they have really good performance of anti-dripping and glue smoothness. Suitable for 90% above glue on the market, nozzle thread is the most common size: 7/16 inch. Colour:As Shown Material:copper Size:Nozzles Size (Bore Diameter x Total Length):2.0x70mm, 2.0x50mm, 2.0x34mm, 3.0x50mm; Thread Diameter:7/16 Inch (10.8mm) Package Contents: 1set * fine tip glue Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.