This 74 Piece Teng Tools Screwdriver Bit Set (TTMD74) includes a ratcheting bit driver, a 6" extension bar, and coupler adaptors. It is supplied in a unique Teng Tools TC tray with a removable lid and dovetail joints, making it suitable for use independently or as part of the Teng Tools TC control system. The set contains a plastic carry case, 1/4" ratcheting bit handle, 6" flex extension bar, 4" extension bar, 1/4" M: 1/4" hex adaptor, and 1/4" F: 1/4" hex F coupler adaptor. The included bits are: Flat (0.6x3.5mm, 0.6x4.5mm, 0.8x4mm, 0.8x5.5mm, 1.0x5.5mm, 1.2x5.0mm, 1.2x6.5mm, 1.4x7.0mm, 1.6x8.0mm), PH (PH1x4, PH2x7, PH3), PZ (PZ1x4, PZ3), Hex (2, 3, 4, 5, 6 & 8mm), TX (TX6, TX7, TX8, TX9, TX10, TX15, TX20 x3, TX25 x3, TX27, TX30, & TX40), TPX (TPX10, TPX165, TPX20 x2, TPX25 x2, TPX27, TPX30 & TPX40), Sq (1, 2, 3), and GR (No.2 x3).