TTMDQ49 – 49 Piece Bits And Socket Set New design quick chuck bits driver. 72 teeth 1/4 drive compact ratchet head (50mm length) for use with the bits driver. Includes 25mm regular bits and 89mm long impact bits covering all the most commonly used sizes in one set. Supplied in the unique Teng Tools TC tray for use on its own or as part of the Teng Tools tool control system.