Spax A2 stainless steel Screw (Dia)4mm (L)40mm Pack of 25. This pack of T-star drive recess mixed heads wood screws are constructed from a durable a 2 stainless steel 40mm in length & come fully threaded. They have serrations for reduced driving-in torque & greater holding power & come hard synthetic coating. They're ideal for a range of DIY applications.