Features and Benefits: 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; Recommended tap wrench: TR-88; use drill size: 7/64″ removes bolts and screws: 5/32″ – 7/32″, 4 mm – 6 mm, No. 6 – No. 12.