The Billet Specialties Vintage Round Air Cleaners feature a top assembly and wing nut that are precision machined from 6061-T6 aluminum then finished in your choice of matte black powder coating or polished for a show stopping appearance. The replaceable paper element, stainless steel hardware and 1" drop steel base complete the package. The design features retro styling cues making it the perfect addition to your hot rod, truck or muscle car! !