The Air Force Chief Master Sergeant 7 ¾ inches in diameter combines precision engraving with a premium finish for riders who want their motorcycle to reflect their style

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Red Line Flag Derby Cover, Harley-Davidson-Road-Glide-2008 The Air Force Chief MasterThe Red Line Flag Derby Cover, combines precision engraving with a premium finish for riders who want their motorcycle to reflect their style, service, or personal story. Product Details Billet Aluminum, Chrome Plated Derby Cover. This derby cover is 7 inches in diameter. Please check your existing derby cover to confirm that it is 7 inches also. This part is also made with a diameter of 7 inches. Our process is to engrave the design onto a raw