Packaging - You will receive a pipe fitting combo set in 5 sizes: NPT 1/8 inch, NPT 1/4 inch, NPT 3/8 inch, NPT 1/2 inch, and NPT 3/4 inch. 5 pieces per size, stored in a plastic box to meet your industrial needs. Made of high-quality carbon steel with excellent acid resistance, corrosion resistance, and high strength. Solid texture, high hardness, standard thread, not easy to slip. Sealing design - Mechanical fasteners function as seals. NPT threads are used for internally threaded pipes; male pipe threads are used for connecting internally threaded pipes or fittings. Hexagonal thread head design allows for quick installation and removal. Shell color: white. Countersunk plugs come with a hex drive for closing off a pipe or fitting. 5 sizes of pipe plugs meet various application needs. Wide range of applications - effectively prevents air, steam, gas, water, oil, and liquids from leaking under pressure. Ideal for blocking intake manifold water ports, water pump ports, water temperature and oil feed holes, engine cylinder holes, and similar uses. Features: These NPT thread plug tubes do not require washers; PTFE tape and thread sealant are recommended for threaded joints. Designed for use with air, water, oil, natural gas, manufactured gas, mixed gas, liquefied petroleum, propane, and LNG. Carbon steel provides corrosion resistance, maintains ductility at high temperatures, and has low magnetic permeability. Carbon steel air fitting with NPT end for connecting to NPT pipes. Suitable for use in water, natural gas, oil, fuel, and pneumatic systems. Product specifications: Dimensions: 1/8 inch, 1/4 inch, 3/8 inch, 1/2 inch, 3/4 inch Temperature range: -65°F to 250°F Maximum pressure: 1000 PSI Groove: Internal hexagon Quantity: 25 pieces Material: Brass Color: Gold Package Contents: 5 x 1/8 inch NPT fittings 5 x 1/4 inch NPT fittings 5 x 3/8 inch NPT fittings 5 x 1/2 inch NPT fittings 5 x 3/4 inch NPT fittings Only the above package content is included; other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture to appear slightly different from the real thing. Measurement may vary by +/- 1-3 cm.