Check the listing for details. 7/16-20UNF Hex Head Pipe Fitting Plug, 3 Pack Male Thread 45# Steel Plug. Condition: New. Listed at 14.83 USD. These threaded male plugs are used to seal holes in machinery, fittings, or pipes to prevent leakage of air, steam, gas, water, oil and fluids under pressure. These plugs are also great for plugging in intake manifold water ports, water pump ports, engine plug holes, and more.Specification:Color: Silver ToneMaterial: 45# Steel, Zinc PlatedThread Size: 7/16-20UNFOverall Height: 14 x 12mm / 0.55 x 0.47 inch (D*H)Packing List: 3 x Pipe PlugAdvantage:Made from 45# Steel for good strength and corrosion resistance. The internal hex head design is convenient for you to install.Instruction:The sealing ring provides a tight sealing performance, easy to install, countersunk hex head increases leverage, used with a wrench.NOTE: When installing, choose the correct wrench to prevent the pipe fittings from being deformed and damaged.