DIY Aquarium Screen Top Universal Cut Out KitIf you need to modify your Red Sea Aquarium Screen Top Kit to fit around a protein skimmer or another large piece of equipment the Universal Cut Out Kit is the perfect solution. The kit includes two external and internal corner adapters, and two pieces of cut out profile that can be trimmed to your desired length. Compatible with all Red Sea DIY Screen Top Kits What's Included? 2x Internal Corner Pieces 2x External Corner Pieces 2x Cut Out Profiles