• 3/8" Drive Ball End Hex Bit Metric Socket 4mm
• Heat-treated socket base for durability
• S2 steel insert bits offer maximum strength
• Double line (SAE) and knurled (metric) ring help easily identify standard and metric sockets
• Hard stamped size markings
• Bright, full polish chrome finish easily wipes clean and resists corrosion
• Meets or exceeds ASME specifications