These professional sets of Grabit screw extractors are like nothing you have ever used. These Grabit Professional screw extractors will quickly and safely remove all types of bolts and screws and as with all the Boa products, the ease of use will surprise you. Drill out the damaged area with the patented cutting end, then flip the tool-extracting end, and then pulls it right out. These sets will do exactly what you want, they fit screw sizes 8-14 and bolts 0.25 in. - 0.375 in. (6mm-8mm) and are efficient in time and performance. Great for: Engineering, Automotive, Marine, Agriculture equipment. 2 Piece set