Pro-LifT M-0003 Autoloading Screwdriver with Ratchet The designed mechanism makes changing bits in seconds. Pull back the handle, turn the chamber to the desired bit, then push the handle forward. 9 pieces bits are stored in revolving chamber and handle. 5 Insert bits load automatically into the bit holder: 4 and 6 mm slotted, PH1, PH2, and PH3. Build-in storage compartment with 4 insert bits that load manually: S1, S2, T15 and T20. 3 way gearless ratchet: Forward, Reverse and Locked.