PZ, Phillips, Pozidriv type screwdriver bits are used for screws with heads with a notch in the shape of two crosses set at an angle of 45° to each other. One of the crosses features a smaller, stabilising indentation. The PZ shape provides a better grip on the screw, minimising the risk of the tool slipping while working. The magnetised tips make work easier. The bits are designed to be used with, among others, impact screwdrivers with a 1/4" chuck. To cope with heavy-duty work, they have been made from high-grade, hardened S2 alloy steel. The composition of the metal from which the bits are made makes them more resistant to torsion when transferring force to the screw, which means they can operate at higher torques. The technology of heat and mechanical treatment of the working part makes the tools sufficiently flexible to absorb the impact. The hardness of 58-61 HRC on the Rockwell scale ensures high wear resistance, guaranteeing a long service life, even with intensive use.