Wera 8681 impaktor diamond bits for square socket screws x 25mm wera 05073931001 this 14in hexagon drive impaktor diamond square socket screw bit from wera is suitable for use with impact screwdrivers these high strength bits are easily recognisable due to their black colour wera 05073931001 8681 impaktor diamond bit for square socket screws no2 x 25mm