Wera 073927 867/1 Impaktor Insert Bit Torx TX40 25mm Carded. TX40 x 25mm Carded. Impaktor-Bit: Above-average product life through optimum utilisation of the material properties and geometry optimally adapted even in extreme conditions; particularly suitable for use with commercial impact screwdrivers; the rough diamond coating is reduced by increased friction from sliding out of the screw. 867/1 Impaktor Insert Bit TORX TX40 x 25mm Carded. For recessed TORX screws. Impact technology for an above-average service life. Particularly suitable for use with customary impact drivers.