This is a DID aluminum rim that was used on a drag racing motorcycle. It is 3.5" wide and 18" in diameter. It has been drilled for screws to prevent tire creep when used aggressively (like starting off the line). It has 40 spoke dimples. I'm not sure what brand hub was used on this rim (Harley?) but after only a few runs down the strip the rim was replaced with a wider rim to accommodate a larger racing slick. It's in good used condition.