Turbo Gold Yellow zinc-plated Carbon Steel Woodscrews (Dia)6mm (L)150mm Pack of 50. This pack of Prodrive drive recess countersunk flat head wood screws are constructed from a durable case & are through hardened. They are 150mm in length & come fully threaded. They have coarse thread & come wax coated for lubrication. They're ideal for a range of DIY applications.