The Duke Tools 6 Piece Screw & Bolt Extractor Set provides a robust solution for extracting damaged or seized fasteners, fabricated from HSS 4341 alloy steel—an economical high-speed variant with 0.95% carbon, 4.25% chromium, and 1.1% molybdenum for balanced red hardness (retaining HRC 62-64 at 550-600°C) and toughness—this set features double-ended bits with aggressive left-hand spiral flutes that grip and back out broken screws upon reverse rotation.Each 51 mm bit integrates a pilot drill tip for initial hole preparation (Ø2-10 mm) without requiring separate tooling, compatible with 1/4″ hex chucks in variable-speed drill drivers (300-800 RPM forward for drilling, low-torque reverse <20 Nm for extraction) and impact drivers under controlled pulses to avoid bit fracture. Suited for soft-to-medium materials like mild steel (up to 250 HB), aluminium alloys, and hardwoods, the uncoated finish promotes heat dissipation during friction-heavy tasks.
