Amtech S0900 5 Peice Screw Extractor Set (Suitable for 3 – 14mm) DURABLE: This handy screw extractor set is made from drop forged, heat treated steel for durability. VERSATILE: Suitable for screw sizes between 3mm-14mm, it is supplied in a handy plastic storage case. How to Use.  Sheered Screw or Bolt, then this is what you need, Drill a pilot hole in the broken part, then use the extractor to unscrew and remove the item. All Amtech hand tools are backed by a three year product replacement warranty and power tools are covered for up to two years, subject to proof of purchase.