Specification:Product Name: Brass Pipe CapMaterial: BrassColor: Gold ToneThread Size: 1/4SAEThread Length : 0.31 " =8mmHex Width :0.51" =13mmHex Height : 0.51" =13mmTotal Size: 13 x 13mm / 0.51-inch x 0.51-inch (W*H) Package Content :2pcs x Brass Cap Description:1.THREAD TYPE. This hex head end plug is a brass pipe fitting with 1/4" female SAE threads.2.MATERIAL.This fitting is made of brass for corrosion resistance, ductility at high temperatures, and low magnetic permeability. Brass can be connected to copper, brass, plastic, aluminum, and welded steel.3. ADVANTAGE. It has Female National Pipe Taper (SAE) threads for connecting to male threaded pipes, creating a tighter seal than straight threads. The round drive countersunk plug has fair vibration resistance and is suitable in low to medium pressure applications.4.APPLICATION. Generally used in Air conditioning refrigeration, plumbing hardware, hot and cold water supply, air energy water heater, construction machinery, refrigeration equipment, etc.