Bahco 202021 techno plus through blade screwdriver set with molybdenum vanadium shank combines great hardness and toughness and has a black tip for added protection the double shaped handle is for use with both hands in large sizes and in proportion to the dimensions of the shank its large surface allows optimum comfortable grip and maximum torque the hexagon nut on hex shank screwdrivers only allows the use of a wrench or open ended spanner for demanding jobs which require extremely high torque