Improved petri dish tower

Improved petri dish holder that holds 10x 90mm petri dishes. It may hold 100mm but I don't have any to test. The trays slide into groves and have tabs on them at the back that fit into additional groves so you don't accidentally pull the tray completely out. There are also mounting holes top and bottom if you want to mount the holder to a wall. Additionally if you want to connect multiple tray holders together there are slots in the back with locking tabs/rods that will connect them together.