Pozi drive head. Zinc and Yellow Plated, high strength and deep threaded wood screw. Material: Steel C1022. Designed to be used in wood, sheet metal, chipboard, PVC-u and MDF. All Multi Purpose Screws are fully threaded with the exception of the following sizes which are part threaded 5×80, 5×90, 5×100, 5×120, 6×80, 6×90, 6×100, 6×120, 6×130 and 6x150mm.