specification:Item Type: Hex Nut_x000D_Material: Aluminum_x000D_Thread Size: 8AN Outer Thread, 1/8in NPT Internal Thread_x000D_Surface: Black Anodizing_x000D_Fitmetn: Suitable for most fluid Features: 1Anti Leakage: The hex nut is equipped with a an O ring to avoid leakage, ensuring reduced flow obstruction, space saving, easy and convenient to use. 2Premium Material: The hex head nut is made of premium aluminum material, with hard black anodized coating, rust resistance and oxidation resistance, making fuel block fittings more durable. 38AN Thread: The thread is 8AN, the inner thread diameter is 1/8in NPT, suitable for most fluid, can be used for vehicle repairing and tube work. 4Easy to Install: The Aluminum hex head nut has a simple installation, convenient and time saving, don't need too much tools or complicated steps. 5Small and Compact: The small and compact nut body does not take up too much use space, having exquisite craft, convenient for storage and use. PackageList:1 x_x000D__x000D_Hex Nut 1 x O Ring