Features: Engineered with precise stamped copper aluminum construction, these hot glues guns nozzles ensures rapid heat distribution and consistent glues flows, featuring a built in steel ball spring mechanism for leak proof performances during crafting or repair tasks. Choose from multiple specifications (2.5x32mm to 2.5x50mm) with universally compatibility for 90%+ glues guns, reinforced by copper bodies and aluminum cores for heat retention and iron spring for extended durability. Ideal for DIYer enthusiasts, and professional requiring precise adhesive control in woodworking, packaging, or electronic assembly projects. Tackle intricate craft designs, secure heavy duty materials, or repair household items effortlessly with temperature resistant nozzles that prevent messy drips and ensures clean application. This 5 piece interchangeable nozzle set adapts seamlessly to diverse bonding needs, combining industrial grade heat conductivity with ergonomic design for hobbyists and tradespeople alike. Specifications: Main Body Component: copper, inner hole: aluminum, steel ball spring: iron Specifications: 2.5x32mm (none hexagonal edges), 2.5x32mm, 2.5x38mm, 3x41mm, 2.5x50mm Package Includes: Pack of 5 Bronze Aluminum Epoxy Firearm Nozzles note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you donot mind befores you order. 2.Due to the differences between different monitors, the picture may not reflect the actual color. Thanks for your understandings.