H. Paulin deck screws are specifically designed or use in ACQ and other chemically treated lumber. Their flat head and their shank are reinforced, and their speed-drill thread allows a faster driving. They don't stain, streak or rust; projects not properly treated or sealed may however cause discolouration of the screws or wood. These 1 3/4" long #8 screws are made in steel with a cedar-colored PermaCoat finish. They are sold by box of 100.