The 148-Piece Master Bit Set has every bit imaginable, even hard-to-find ones, for a wide range of applications. The bits are organized in a durable, easy-to-open case. The set includes 1", 2" and 3" slotted, square, Phillips, star, pozi, SAE and metric hex, tamper-resistant star and hex bits. It also includes clutch drive, spline drive, spanner, 3- and 4-wing bits, and 1/4" and 3/8" socket adaptors. You won’t find a more extensive array of bits anywhere else!