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, 4 pieces per size. - Made of high quality stainless steel, acid-resistant, corrosion-resistant, high strength, strong texture, high hardness, standard threads, 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. HEX DRIVE TYPE - 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 suitable for blocking intake manifold water ports, water pump ports, water temperature and oil feed holes, engine cylinder holes, etc. Color: Silver Material: Stainless Steel Package Contents: 1 set Pipe Plug Accessories Combo Kit 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 be slightly different from the real thing. The measurement allowed error is +/- 1-3 cm.