TurboGold Yellow zinc-plated Carbon steel Wood Screw (Dia)3.5mm (L)30mm, Pack of 200. This quality single thread multipurpose screw is durable and shaped to drive fast. It is suitable for screwdrivers, combi drills and impact drivers.. This pack of Prodrive drive recess countersunk flat head wood screws are constructed from a durable case and are through hardened. They are 30mm in length and come fully threaded. They have coarse thread and are ideal for a range of DIY applications. Woodscrews by TurboGold.