Turbo Ultra A2 Stainless steel Woodscrew (Dia)6mm (L)110mm Pack of 50. This pack of Prodrive drive recess double countersunk head wood screws are constructed from a durable a 2 stainless steel 110mm in length & come partially threaded on longer screws. They have rifled shank with deep thread. They're ideal for a range of DIY applications.