Goldscrew Yellow zinc-plated Carbon Steel Woodscrews (Dia)3mm (L)12mm Pack of 200. This pack of Prodrive drive recess double countersunk head wood screws are constructed from a durable steel with double hardened core. They are 12mm in length & come partially threaded on longer screws. They have a rifled shank with under head ribs & come wax coated & heat treated. They're ideal for a range of DIY applications.