bolt extractor kit can helps faster studs , bolts , socket screws , and fittings bearing steel materials , practical and flute screw extractor dimensions are engraved on the-extractor for easy identification Bolt remover that remove screws , whether working on wood or metal , are for ideal for construction , automotive , home projects or for industrial use Our flute is designed to embed themselves deeper into the metal as you turn the tool , so as the fastener resistance increases , the-extractor ' s grip increases, Manufacturer: Watreketal