These Forgefix Multi-Purpose Pozi Screws with countersunk heads have a zinc yellow passivated finish for increased durability. The screws are immensely popular & versatile, & used in all trades including joinery, electrical & plumbing. Also widely used in DIY applications. Application: Suitable for use with many materials including PVCu, Timber, Chipboard, MDF, & other similar types. The Zinc Yellow Passivation process of electroplating is similar to the ' Galvanised' & ' Zinc Pla