Features M20 Socket Set: Made of premium impact grade CRMO, black coating for enhanced durability. The tap socket is wear resistant, and for a long service life. Safe Locking Mechanism: M20 square tap socket features spring loaded detent ball system locks socket in place, ensuring safety and preventing drops. High Contrast Size Markings: M20 tap socket features permanent laser etched markings for easy reading, even in low light conditions. Reduced Wear and Increased Torsion: Rounded corner design reduces wear by applying force on fastener wall, not fastener corners. Specifically designed for use with impact drivers. For Tap Connection: Square tap socket is suitable for M20 metric machine taps, compatible with electric, pneumatic, or manual wrenches. Specification: Item Type: Square Tap Socket Material: CRMO Size: M20 Application: Connect national standard machine taps Applicable Equipment: Electric, pneumatic or manual wrench PackageList: 1 x Square Tap Socket Package List 1 x Function Generator 1 x USB Cable