When Race Tech receives a part for anodizing, it's disassembled (if necessary) and cleaned of any oil residues. Next, the part is etched in a sulfuric acid bath to open the surface of the aluminum, clear pores of contaminants and assist the penetration of the aluminum oxide. If a light, cosmetic color is being applied to a part, the actual anodizing takes place when the part is electrified and placed in another sulfuric acid bath for 20 to 30 minutes. Parts that require the extra durability of hard-anodizing get zapped for a total of 50 to 90 minutes. Hard-anodized parts exhibit extreme corrosion- and abrasion-resistance comparable to nitrated steel, the metal used in most files. Many dirt bike forks and Harley drive pulleys have a hard-anodized surface.