The perfect finishing touch for any stock or custom engines, these S&S tappet covers are CNC machined from billet aluminum and polished to a show finish. The CNC machining assures dimensional accuracy, while the billet material provides extra strength and dimensional stability over a wide temperature range. Fits: 1999-'16 HD big twins, and S&S crankcases. Features and Benefits: Unlike cast aluminum, billet has no internal voids or impurities. No residual strain from thermal contraction or expansion means no cracking or changes in shape. Simple to install upgrade that looks great. Kit contains covers, gaskets, and hardware.Billet chrome finish