Bikers Choice Midwest Acorn Chrome-Plated Spacer 3/8" I.D. x 5/8" O.D. x 1/2" L MPB510 These parts vary slightly from other spacers as they all have the same O.D. dimension for a uniform look, allowing them to be used as mounting spacers on fenders or custom builds Chrome-plated steel Sold in packs of 5