Würth® 8 Piece Screw Extractor Set M3–M45. Covers a wide range of screw and bolt sizes from M3 up to M45. Use: Screw & Bolt Extraction. Range: M3 – M45. Size 8: M33–M45. Professional Würth screw extractor set designed for removing snapped screws, bolts, and studs without damaging surrounding threads.