6 Spiral Flute Extractors - For use on common fasteners where lower torque is adequate. 13 Multi-Spline Extractors - For use when higher torque or a lower profile tool is needed. 13 Bolt Extractors - For use when part of the fastener is exposed. 16 Left-Hand Cobalt Drill Bits - Use these to drill out the interior of the fastener. They often extract the fastener by themselves.