These Forgefix Multipurpose Pozi Compatible Screws have a chrome plated finish for increased durability Their countersunk head is designed to sink flush with substrates to leave a smooth surface finish These screws have single threads designed to offer higher pull-out values and quicker insertion The screws are immensely popular and versatile and used in all trades including joinery electrical and plumbing Suitable for use with many materials including PVCu Timber Chipboard MDF and other similar types