Feature: 1. DURABLE MATERIAL: Tap socket is made from premium impact grade chrome molybdenum steel with black phosphas finish for enhanced durability 2. REDUCE FATIGUE AND DISCOMFORT: The spring loaded detent ball system lock socket into place for security and prevent dropping, you can use with confidence 3. HIGH TORSION: Radius corner design reduce wear and increase torsion on fasteners by placing force on fastener wall rather than fastener corners. Engineered for use with impact drivers 4. CLEAR LASER MARKING: High contrast size marking is permanently laser etched and easy to read even in low light, which is clear enough for you to see and access 5. NON FALL OFF: Tapered square end socket come with non slip stuck hole, possess strong bite force to prevent falling off. For connecting Chinese standard machine taps Specification: Item Type: Tap Socket Material: Cr molybdenum steel Specification: M8 Use: Connect with ISO standard machine taps Compatible Equipment: Electric, pneumatic, or manual wrench . Package List: 1 x Tap Socket