I designed this holder to keep screwdriver bits in order and easy accessible in my garage. The interface matches hooks for the board (rather vintage) I "inherited" with the garage. I am not sure if they are in any way "standard". See picture of the hook (the wire diameter is 3.4mm, the protruding segment length approx.23mm and the angle approx.75deg from vertical). NOTE: If you would like to see an interface for a different hook geometry, please drop a message. I will see what I can do.