●Size: 6AN female to 1/4 inch, the thread size of the 6 AN is 9/16 UNF. Fits to 1/4" OD hardline, please measure before purchase. ●Material: Made of aluminium alloy fitting and brass ferrule. ●Sealing: The AN thread of the flare is sealed by a 37 degree angle. ●Application:This 1/4 compression to 6an fitting is widely used in fuel delivery, fuel system, engine modification, etc. ●Note: Only applicable to stainless steel or aluminum hardline.