These Irwin Hanson® 534/524 series spiral-flute screw extractors are designed to remove broken studs, bolts, socket screws and fittings.
Each screw extractor has an aggressive left-hand spiral design that provides extra gripping power.
The tenacious 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.