5 piece screw extractor set To fit drill sizes: 7/64 Inch, 9/64 Inch, 5/32 Inch, 1/4 Inch Drive, 19/64 Inch The set is supplied in a handy storage case. 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 As the fastener resistance increases, the extractor’s grip increases