5 pc. Spiral Screw Extractor is the ideal way to extract things like stuck screws and bolts with ease. It doesn't expand the material while it's working. It's an especially great choice for use with softer materials or thin-walled pieces.This five-piece screw extractor set includes five different sizes of extractors, which means you'll have plenty of options to find the absolute perfect fit the next time you're in need. The screw-out set works with both SAE and metric units, for added versatility.