What You Get - 10 pieces of drills (sizes from #1-#10),10 pieces extractor (sizes from #1-#10),1 piece of extension bit holder (6.35mm)and 1 piece of the socket adapter(4mm) color: as show Premium Screw Extractor - Made of high-speed steel 4241 for maximum strength and high hardness, can work on irregular and jagged irregular cuts Efficient Screw Remover Tool - The magnetism inside the extension bit holder socket adapter prevents the tips from falling, quickly remove screw and bolts, fit most electric drills Wide Application - Ideal for removing most stripped, damaged, embedded, rusted and painted-over screws or bolts, such as Allen bolts, machine screws, lag bolts, wood screws, hex bolts, sheet metal screws, etc. Please Note!! - Safer to used with the electric hand drill, instead of the hammer drill, must be reverse use in the whole process and in low speed and reverse use.