OEMTOOLS 22983 Metric Hex Bit Socket Set, 9-Piece Set Includes: (1/4" Dr.) 2, 2.5, 3, 4mm (3/8" Dr.) 5, 6, 7, 8, 10mm Made with S2 steel bits Knurling position is optimized for best finger gripping position. Go ahead and put serious torque on, it wont slip Silver with cross hatch marking indicates Metric sizes