Set of 3 PH1, PH2 and PH3 impact bits from the Bosch Impact Control series, 25mm long and 1/4" shank, suitable for use with standard and impact screwdrivers and screwdrivers in heavy industrial tasks and intensive assembly. The special torsion zone gives the tip extremely high durability for extended use, and the S2-modified steel and optimized heat treatment process allow maximum performance under the toughest conditions.