Workshop handle

I use this handle in my workshop for nearly all drawers.
As center bar I use an aluminum bar with a diameter of 8mm - the big center hole has a diameter of 8.5mm.
The bottom holes are for M4 screws. Typically a single screw is good enough but...
For wood screws you either need 4mm ones or shrink the holes.
I prefer this setup to a single bar as there are no visible screw holes plus its more elegant (personal taste).