Custom Press on Decorative Chrome Metal Acorn Bolt & Nut Covers For 9/16" In Nuts & Bolts (Wrench Size Not Thread Size) Chrome Plated Metal Construction Universal Fit For Nut & Bolt - 9/16" Wrench Size Press on Application (No Adapters Required) Heat Resistant For High Heat Applications Like Engine Parts Add A Custom Touch In Seconds & Hide Those Ugly Bolt Heads & Nuts Please See Item Details Above For Dimensions Of Product