All bits in the set have a 1/4-inch hex shank for use with three-claw drill chucks and hex drill/screwdriver holders
The Extra Hard set, 50-piece contains all the standard bits you need for all your screwdriving applications. The screw bits are made of heat-treated modified S2 steel for hardness and wear resistance. They are colour-coded to make it easier to choose the right bit. The set is housed in a robust Pick and Click cassette that allows you to create your own set and store your bits neatly and protected. It has a magnetic screwdriver handle to hold bits securely and a bit holder to help you get your jobs done easily.