Wera 8514 impaktor diamond bits for phillips screws 50mm wera 05073957001 this 14in hexagon drive impaktor diamond square phillips ph3 bit from wera is suitable for use with impact screwdrivers these high strength bits are easily recognisable due to their black colour wera 05073957001 8514 impaktor diamond bit for phillips screws ph3 x 50mm