PRECISION SEALING TECHNOLOGY: Features a 37 degree flare design that firmly seals between pipes and fittings to effectively prevent leakage in critical systems such as brakes and cooling systems HIGH TEMPERATURE RESISTANT: Made of aluminum alloy, this set can withstand extreme temperatures from 65°F to 252°F and is ideal for high temperature environments such as oil systems and engine upgrades UNIVERSAL COMPATIBILITY: This nut and sleeve combo set supports multiple sizes including 4AN 1/4, AN6 3/8, AN8 1/2, AN10 5/8, AN12 3/4, making it ideal for various automotive and motorcycle applications such as engine modification and repair PROFESSIONAL INSTALLATION RECOMMENDED: For best installation, first attach the nut and sleeve to the pipe and then use the 37° flare tool BLACK FINISH: Black coating adds a professional, understated aesthetic to your setup while increasing durability, combining both functionality and visual appeal, Manufacturer: Asukohu