I've just built my own frag racks out of black egg crate and
magnets from J&L
Drill the frag rack where you want the magnet to go into. Insert the smallest clip from the package through the hole from the inner part of the rack and screw the magnet on. Works like a hot damn, looks great and is nice and cheap.
Heres one I made with white eggcrate before I found a supply of the black stuff
