1. Made of brass material, corrosion resistant.2. Hex locknut locks two threaded fittings into place for stability and reduced vibrations.3. 1/4BSP female threads for use with male threaded pipes and fittings.4. Easy to install and durability.Specification:Product Name: Hex Nut PipeMain Color: Brass ToneMaterial: BrassWeight: 40gThread Dia.: 12mm / 1/4BSP(Female)Overall Size: 17 x 2.5mm / 0.67-inch x 0.1-inch(D*H)Package Content: 15pcs x Hex Nut Pipe