All copper nozzles have a built-in anti-dripping steel ball and waterproof rubber o-ring that prevents the nozzle from leaking glue, whether during preheating, during or after use. Improve work efficiency! This hot glue tips fits more than 90% glue on the market, nozzle thread is 10.8mm (7/16 inch). Come with 5 different size nozzles (Small Bore & Long Tube) all in 1 pack, each nozzle has a different purpose and you can use that best suits for your requirements. Bore Diameter x Length: 2.0x34mm, 2.0x50mm, 2.0x70mm, 2.0x100mm, 3.0x50mm; Thread Diameter: 7/16 Inch (10.8mm) Made of pure copper material with excellent thermal conductivity and hundreds of durability tests. It can make the glue smoothly and steadily, and wear- for long-term use! Long tube nozzle have an average glue amount for hard-to-reach areas. Perfect DIY accessories for precise crafts or small projects such as decorative toys, artistic flowers, home repairs, DIY craft projects and more., Manufacturer: PokFhgur