TX, star, Torx-type screwdriver bits are used for screws with heads notched in the shape of a six-pointed star. This significantly increases the contact area, allowing the fastener to be tightened with very high force without damaging the head and working edges of the tool. 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.