Features High hardness chrome molybdenum steel material: Made of chrome molybdenum steel with high hardness, with black coating treatment on the surface, corrosion resistant and durable. Strong compatibility: standard 3/8 inch square drive, suitable for hand tools, pneumatic tools or power tools. Left spiral design: provides extra grip strength and faster threading speed. Easier to use. Firm fit: a precisely engineered hex head that combines with a wrench or socket wrench to exert maximum torsion and easily pull out the screw. SIZE IDENTIFICATION: Highly visible laser etched sizes for quick identification and improvement of work efficiency. Specification: Item Type: Damaged Screw Extractor Set Material: alloy steel. Package list: 25 x damaged screw extractors. 1 x connecting rod. 1 x storage box Package List 25 x Damaged Screw Extractor 1 x Connecting Rod 1 x Storage Box