MULTIPLE SPECIFICATIONS: This nozzle is designed to reach narrow spaces, with 4 different nozzle diameters to meet various application needs. Nozzle sizes: 2.0x34mm, 2.0x50mm, 3.0x50mm, 2.0x70mm. Thread diameter: 10.8mm. MATERIAL – PURE COPPER: Made of high-quality brass, tested extensively for durability and long-lasting performance. Copper nozzles offer extended service life compared to aluminum alternatives. NO DRIPPING: Each copper nozzle features a built-in anti-leakage steel ball valve, preventing glue leakage during preheating, use, and after cooling down. WIDE RANGE OF USES: Suitable for use with glue guns as an accessory for crafts, floral arrangements, toys, woodworking, plastic, glass, ceramic, metal, stone, brick, paper, and fabric applications. Practical for everyday household and DIY projects. HIGH COMPATIBILITY: Designed to fit most glue guns that accept 10.8mm diameter nozzles. If your existing nozzle has a 10.8mm thread diameter, this product is a compatible replacement option.