H2Pro 24" Glass Canopy for 15 /20/ 55-Gallon Aquarium Fish Tank (23.07"x11.1") Fits Most 15/20H/55 Gallon Fish Tanks. There are different aquarium manufactures. PLEASE MEASURE your tank opening to the closest millimeter before purchasing! Dimensions: 23.07 x 11.1 x 0.16in (586 x 282 x 4mm) Features new and improved tempered glass; durable and reduces evaporation Clear plastic back strip that can be cut to fit your aquarium Provides the area for your lighting to sit while allowing simple access to your aquarium