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. Tight Fit: An Accuracy Designed Hex Head Used to Pair with A Wrench Or Socket to Apply Maximum Torsion to Easily Extract The Screw. 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