Box nuts with interior hexagon made of chrome vanadium steel S2, industrial steel, fits for all cordless screwdrivers, power drills, bit holders, jaw chucks, drill chucks, manual impact screwdrivers, etc. Easy screw connections with all hexagon screws, drilling screws, sandwich panel screws with exterior hexagon head. Ideal for all DIY work and for professional use. Drive 1/4″ hexagon according to ISO 1173, E 6.3, quick and easy holding of screws with the permanent magnet, length 50 mm