The one-handed selector ring offers 3 settings (screw, unscrew and tighten) and the 7 bit storage compartment cap can serve as an additional mini bit holder for difficult to reach screw locations. Bi-material, ergonomic handle offers a powerful, comfortable screwing action and is partly hollow for storage of additional bits or screws. A powerful magnetic adaptor holds the bit and the screw.Contains 8 bits :For slotted heads : 4 – 6.5For Phillips : PH1 – PH2For Pozidriv : PZ1 – PZ2For hexagon socket heads : 4 – 6.