Product Description              Designed to remove broken studs, bolts, socket screws and fittings Aggressive left hand spiral design for extra gripping power Spiral flutes are designed to embed themselves deeper into the metal as you turn the tool, so as the fastener resistance increases, the extractor's grip increases Extractor size and recommended drill bit size are etched on each tool Set includes: Spiral Flute Screw Extractors in sizes: EX-1, EX-2, EX-3, EX-4, and EX-5 Drill Bits in sizes: 5/64, 7/64, 5/32, 1/4, and 19/64                 From the Manufacturer              Irwin Industrial Tools 11117 10-Piece Set Spiral Flute Screw Extractors with Cobalt Drill Bits - Pouched. For harder metals, choose a spiral screw extractor.

• Designed to remove broken studs, bolts, socket screws and fittings
• Aggressive left hand spiral design for extra gripping power
• Spiral flutes are designed to embed themselves deeper into the metal as you turn the tool, so as the fastener resistance increases, the extractor's grip increases
• Extractor size and recommended drill bit size are etched on each tool.
• Set includes plastic pouch B000GXBM7Q