Includes 9-pc. 1/2 in. drive hex bit sockets: 1/4, 5/16, 3/8, 7/16, 1/2, 9/16, 5/8, 11/16, 3/4 in.; 14-pc. 1/2 in. drive hex bit sockets: 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 mm; 9-pc. 1/2 in. drive hex bit sockets: T30, T40, T45, T47, T50, T55, T60, T70, T80 Strong, Precise Steel Bits – Bits are made of S2 heat-treated steel and are machined to precise tolerances for an exact fit with fasteners Straight, Permanent Connection – Bits are pressed directly into the socket for a permanent connection that won't loosen over time or under stress Large, Stamped Markings – Markings are permanently impressed into the material by a roll-stamp die and are clearly visible because of their extra-deep outline Secure Drive Tool Engagement – Detent grooves and beveled edges provide a smooth and secure connection with the drive tool Socket Organization Rails and Tray – The twist-to-lock clips on the rails hold sockets securely and can be repositioned anywhere along the rail