Feature1SPECIFICATION: 1/4in drive has M4 M5 M6, 3/8in drive has M8 M9 M10 M12 M14, 1/2in drive has M16 M18. A total of 10 pcs bit sockets for you to use.2CRV MATERIAL: These spline bit sockets are made from chromium vanadium steel, with high strength, ensures excellent durability.3POLISHED SURFACE: The drill bit socket is corrosion prevention, with a smoothly polished mirror surface without burrs.4STORAGE BOX: This triple square spline bit socket set comes with a tight and sturdy casing for easy carrying and storage.5ENGRAVED SIZE: The spline bit socket has laser engraved size, which are clear to read, convenient for you to identify.Item Type: Triple Square Spline Bit SocketMaterial: Chromium Vanadium SteelSpecification: 1/4in Drive: M4 M5 M63/8in Drive: M8 M9 M10 M12 M141/2in Drive: M16 M18 Package List10 x Triple Square Spline Bit Socket1 x Storage Box Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-Dadangjia