26-Piece Bolt Extractor Screw Extractor Set and Cobalt Drill Bit Set, Case with 13-Piece Bolt Extractor, 6-Piece HSS Drill Bit, 6-Piece Spiral Screw Extractor and 1-Piece Socket Adapter. 4-in-1 Screw & Nut Remover Kit- Including 6-piece spiral screw extractors: 1#, 2#, 3#, 4#, 5#, 6#; 6-pieces HSS drill bits: 3/32″, 1/8″, 5/32″, 1/4″, 9/32″, 3/8″ and 13-piece bolt nut remover set: 3/4″ (19 mm), 11/16″, 17mm, 5/8″ (16 mm), 9/16″ (14mm), 13mm, 1/2″, 12mm, 7/16″ (11mm), 10mm, 3/8″, 5/16″ (8mm), 1/4″ and 1-piece 1/4″ extractor extension. Remarkable Quality- The drill bits of this extractor set are made of high-speed steel, which are harder, expensive, and hold a high temperature. Flutes form helps clear chips and debris away from the bit, decreasing friction and heat for a faster, cooler drilling ° Split Point with straight shank prevents walking and makes drilling precise. 1/4″-3/8″ Impact Adapter-The 3/8 impact adapter can convert the original hexagonal polygon size to square head size, which can be used to install 1/4 Hex Shank will fit all Quick Change systems and standard drill chucks, which is ideal for both professionals and DIYers. Solid Carrying Case for Storage – 26 pieces tools are all packed in a rugged, compact carry case for storage and portability. Each tool fits snugly into its respective place to prevent moving around and scraping. Usage Scenario-Suitable for removing most damaged, frozen, rusted fasteners including bolts, nuts and team are all professional, so you can ask us if you have any problems during the use.