TL Reefs frag racks are designed to be everything you need for your coral propagation. - FDA grade silicone locking layer holds plugs securely. Nothing will knock them out. - Legs are adjustable for a tray height of 1.5" - 2.5" - Can be stacked to easily move several trays at once, or for transporting to shows. - 5/8" diameter holes for larger plugs, such are ORA plastic plugs. - Holds 72 frags and measures 11.75" long x 5.75" wide x 2.5" tall