10-Piece Square Section Screw Extractor Set 10 Piece Proto Screw Extractor Set. Screw extractors may be used to remove broken, rusted, cross-threaded or otherwise damaged screws. Made from High-Carbon Alloy Steel that is very strong and fracture resistantThe gradual taper prevents wedging and seizingUnique corner enables a positive bite for removing the stud without damaging the object the stud is being removed fromWorks on both right and left handed fastenersEach piece is stamped with a size that matches the drill bit to be used with the extractorContents10-Piece Screw Extractor SetStock No.1/8,3/16,7/32,5/16,3/8,7/16,17/32,5/8,3/4,1 in.282-855