Goldscrew Yellow zinc-plated Carbon Steel Woodscrews (Dia)4mm (L)35mm Pack of 200. This pack of Pozidriv countersunk flat head wood screws are constructed from a durable case & are through hardened. They are 35mm in length & come fully threaded. They have coarse thread & come wax coated for lubrication. They're ideal for a range of DIY applications.