A high quality heavy duty SIX PIECE bolt extractor set. Designed to remove broken, rusted, painted over, rounded studs, bolts, nuts, etc. Reverse spiral flutes are designed to bite down on the target in order to provide maximum gripping power. 3/8" drive. Manufactured from tough Chrome Molybdenum steel (Cr-Mo) for longevity and tensile strength. Sizes are as follows: 1/4" (6mm), 5/16" (8mm), 3/8" (9.5mm), 7/16" (11mm) and 1/2" (12.7mm). Each bit has the size etched on the side for easy identification. Also included is a 3/8" drive to 1/4" drive adapter. All supplied in a handy slide shut carry case for neat storage and transportation.