Irwin POWER GRIP 7-Piece Screw and Bolt Extractor Set 7-piece power bolt grip set. Grips both metric and SAE Universal Lobular Design fits both sizes. Black oxide finish with white markings prevents rust and easy-to-read markings. Maximum gripping power reverse spiral flutes are designed to bite down. Removes rounded off, painted over, damaged, and rusted over nuts and bolts. Shear-resistant shank high-carbon steel shank is larger than most fastener shanks and resists torsional shear. 1/4 hex shank for use with cordless drills, impact drivers, corded drills, and nut runners. Power groove allows for use with quick change adapters. Includes sizes 3/16 , 1/4 , 5/16 , 3/8 , 10mm, 7/16 , 1/2 , and plastic case. Pieces In Set 7 pcs, Pkg Qty 1, Package Type Clamshell