Wera 8671 impaktor diamond bits for torx screws 25mm wera 05073927001 this 14in hexagon drive impaktor diamond torx tx40 screw bit from wera is suitable for use with impact screwdrivers these high strength bits are easily recognisable due to their black colour wera 05073927001 8671 impaktor diamond bit for torx screws tx40 x 25mm