Niuniu Glue Gun Nozzles Size(Inner Diameter x Length): 2.0x70mm, 2.0x50mm, 2.0x34mm, 3.0x50mm; Thread Diameter: 10.8mm High-quality Material - Made of pure copper with excellent thermal conductivity, make glue flow more smoothly and faster. Hot Glue Gun Accessory - 4 different nozzles can help to glue in narrow spaces, convenient to replace, meet different job requirements. Leakproof Design - Come with the built-in leakproof steel ball and waterproof rubber o-ring, can prevent glue leakage, improve work efficiency. Wide Application - Can be used with most glue guns to decorate toys, artistic flowers, home repairs, DIY craft projects, Christmas tree decorating. Specification: color: gold Material: Copper Thread Diameter: 10.8mm(7/16 Inch) Nozzles Size (Bore Diameter x Overall Length): 2.0mm x 70mm 2.0mm x 50mm 2.0mm x 34mm 3.0mm x 50mm Package Included: 4 x Copper Glue Gun Nozzles