It is suitable for use in many materials such as timber, chipboard, MDF, PVCu, plastic and fibreglass. The zinc yellow passivation process of electroplating is similar to the galvanised and zinc plated processes but with the addition of a yellow dye. It provides a coating that is aesthetically pleasing and offers excellent resistance to corrosion. TX20 high quality please use with Torx head. Size: 4cm H x 0.45cm W x 0.45cm D