Features STRONG COMPATIBILITY: Standard 3/8 inch square drive suitable for hand tools, pneumatic tool or electric tools. TIGHT FIT: An accuracy designed hex head used to pair with a wrench or socket to apply maximum torsion to easily extract the screw. HIGH HARDNESS CHROMIUM MOLYBDENUM STEEL MATERIAL: Made of high hardness chromium molybdenum steel, with black coating treatment on the surface, anti corrosion, and durable. LEFT HAND SPIRAL DESIGN: Provides additional grip strength and faster threading speed. Easier to use. SIZE IDENTIFICATION: Good visibility laser etched sizes for quick identification, improving work efficiency. Specification: Item Type: Damaged Screw Extractor Set  Material: Alloy Steel Package List: 25 x Damaged Screw Extractor 1 x Connecting Rod  1 x Storage Box  Package List 25 x Damaged Screw Extractor 1 x Connecting Rod 1 x Storage Box