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, NPT 3/4 inch, 5 pieces/size, stores in 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 slide. 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, and are used for connecting internally threaded pipes or fittings. Hexagonal thread head design for quick installation and removal. Shell color: white. Countersunk plugs come with a hex drive for closing of a pipe or fitting. 5 sizes of pipe plugs meet different needs. Wide range of applications - not only prevents air, steam, gas, water, oil and liquids from leaking under pressure, but is also Perfect for blocking intake manifold water ports, water pump ports, water temperature and oil feed holes, engine cylinder holes, etc. 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, manufactured, mixed, Liquefied Petroleum or Propane and LNG Air. Carbon steel is corrosion resistant, ductile at high temperatures and has low magnetic permeability. Carbon steel air fitting, NPT end for connecting to NPT pipes, stainless steel corrosion resistant, can be used in water, natural gas, oil and fuel, and pneumatic tools. product specifications Dimensions: 1/8 inch 1/4 inch 3/8 inch 1/2 inch 3/4 inch Temperature range:-65 to 250 Maximum pressure: 1000 PSI Groove: Internal hexagon Quantity: 25 pieces Material: Metal colour: black 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, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.