Pro-Bolts Stainless Steel range These highly polished products will not fade or corrode due to the excellent material properties of 316 Stainless Steel. Whilst the rolled threads give a smoother, stronger finish. Zero maintenance and easy to fit. Also available in black and gold stainless steel which not only looks great but has other benefits too. This beautiful long lasting finish results from an application of Diamond Like Carbon Coating (DLC). This gives supreme hardness and corrosion resistance provided by a nano composite coating, which increases the fastener lifetime dramatically and helps to prevent galling. By incorporating them right from the beginning, the overall system cost can be held level or may even be reduced. Please note that due to this special coating stainless steel is not identical to our aluminium.