Insulated Ball End Screwdriver

Some insulated hex key Screwdrivers have a ball on one end, which allows the tool to be used at an angle off-axis to the screw. While providing access to otherwise inaccessible fasteners, thinning of the tool shaft to create the ball shape renders it weaker than the straight-shaft version, limiting the torque that can be applied. The tool also makes point contact with the fastener as opposed to the line contact seen in the straight style tools.