Gymex bumper hooks are movable weight plate holders allowing you to choose the positioning of your weights. It can be attatched to any Gymex rig. Each peg is sold individually.
 
FAQ
How much can one peg hold?
Each peg can hold up to 80Kg of plates
Can this be attatchd to any rack or specifically Gymex racks?
These are specifically for Gymex racks or rack with a 29ml hole peg on a 60x60 box.