Flex Impact Socket, Drive Size: 1/4", Number of Points: 12, Socket Depth: Standard, SAE or Metric: Metric, Size: 10mm, Overall Length: 2", Finish: Black Oxide, Material: Alloy Steel, Drive Type: Square, Output Type: Hex, Features: Universal Ball and Spring Design which Allows for a 30 Degrees Working Angle; Smooth 360 Degrees Rotation; Ideal for Use on Stubborn or Damaged Fasteners, and on Fasteners Made from Soft Materials; TorquePlus(TM) Design Allows for Quick and Easy Socket Engagement to the Fastener Flats, Not Corners; Radius-Corner Design Shifts Contact Area and Stress Away from Fastener Corners, Minimizing Slippage; Extended Fastener Life; Ease of Turning Worn Rounded or Rusted Fasteners; Size Stamped on Tool for Easy Identification; Side Locking Hole for Securing Socket to Tool, Standards: ASME B107.2