I designed this tool holder based on a Magnusson screwdriver rack I already have. It holds six drivers and can either be screwed to a wall or attached to the French cleat backplate with three M4x16 countersink bolts. I've got mine on the cleat to move it around. The holes for the drivers are slightly oversized, 6mm, which fits my Torx drivers. You could enlarge them if you needed to. The spacing allows handles of about 36mm in diameter to not get in the way of each other.