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 6 contains the following6 x torx t10 x 100mm t15 x 100mm t20 x 100 t25 x 100mm t30 x 150m and t40 x 150mm