The 35-piece Pick and Click Impact Control HSS twist drill and impact control screwdriver bit set is an individually assembled set with very robust bits, ideal for heavy-duty work. The screwdriver bits have a special torsion zone, which gives them extreme durability during longer working hours, so that they can withstand even the high torque of impact screwdrivers. S2-modified steel and optimized heat treatment methods give the highest durability for best performance, even with extensive assembly, industrial work and heavy drilling work in metal. The Impact Control HSS twist drill bits made of precision milled quality metal with their oxide-coated spiral cutting edges show less wear and excellent surface properties when drilling in steel, iron and other metals. All bits have a 1/4 inch external hex shank and are suitable for use with drill drivers, screwdrivers and especially impact screwdrivers. The set is part of the Bosch Pick and Click system, which enables individually assembled a