Magnetic Hole Coral Frag Rack 23 plugs Invisible Acrylic -SPS LPS ZOA Reef Our top of the line Frag Racks provide easy placement of coral fragments. Strong magnets hold this frag rack inside your tank. They can securely hold a full load of frag plugs for up to 1/2 inch thick glass or acrylic aquariums. Frag rag platform 6.5" X 7.6" Holds up to: 13 frag plugs with 2/5" or smaller stems Pure Flow Acrylic