Stanley essential screwdrivers have bars made from chrome vanadium steel which resists bending and snapping the handles are made from polypropylene with tpr overlay for increased comfort and reduced fatigue increased torque can be applied by using another bar through the hole at the top of each handle this set of 12 contains the following 2 x phillips ph1 x 75mm and ph2 x 100mm2 x pozi pz1 x 100mm and pz2 x 100mm3 x flared slotted 55 x 100mm 65 x 150mm and 8 x 175mm2 x parallel slotted 4 x 100mm