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, 44+1 piece contains all the standard bits and sockets 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 build your own toolbox and store your bits neatly and protected. It includes a magnetic screwdriver handle to hold bits securely.