Goldscrew Yellow zinc-plated Carbon Steel Woodscrews (Dia)4mm (L)45mm Pack of 200. This pack of Prodrive drive recess countersunk flat head wood screws are constructed from a durable metal 45mm in length & come partially threaded on longer screws. They have a thin shank with double helix angled thread & come wax coated for lubrication. They're ideal for a range of DIY applications.