16 lb. polished billet radiator cap with Chevy Bowtie Billet Specialties radiator caps are 2.5” diameter and are machined from 6061-T6 billet aluminum. Knurled sides provide a positive grip. Available in 7lb or 16 lb applications, the billet top and radiator cap come unassembled to allow for proper positioning of the logo. Product Features - Industry leading mirror finish polish - High quality Stant® radiator cap included