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Large Hard-Stamped Size Identification.Double Line (SAE) and Knurled (Metric) Ring to Easily Identify Standard vs. Metric Sockets.Full Polish Chrome Finish Cleans Easily and Resists Corrosion.Surface Drive® Technology Reduces Fastener Rounding.Chamfered Opening to Guides Fastener Into Socket.Meets or Exceeds ASME B107.1 and US Federal Spec. GG-W-641 E