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 Extractor1 x Connecting Rod 1 x Storage Box  Package List 25 x Damaged Screw Extractor 1 x Connecting Rod 1 x Storage Box