We didnít take any short cuts in manufacturing our billet aluminum sill plates. They are completely machined out of a solid piece of aluminum. We didnít quickly machine or bend a thin sheet to produce our plates. And with our precision machining, you get a part that fits perfectly every time. Our sill plates are available in a raw machined or highly polished finish. Sold in pairs. EASY TO INSTALL UTILLIZING FACTORY MOUNTING HOLES.