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 20 contains the following4 x phillips ph0 x 50mm ph1 x 75mm and ph2 x 100mm x23 x pozi pz1 x 100mm and pz2 x 100mm x25 x flared slotted 55 x 100mm x2 65 x 150mm x2 and 8 x 175mm5 x para