Features: 1.Made of high quality acrylic material, sturdy and durable for long time use. 2.Available for all kinds of open fish tank/pet box without tension and need to be covered. 3.Can be hung directly on the edge of the tank, bracket can be placed on the lamp frame, filter, tank cover and other equipment. 4.Can hold up to thickness 6-12mm of glass, two acrylic screws can be tightened to make it more stable. 5.Wonderful accessory for aquarium, fish tank. High transparency, more beautiful. Specifications: Item type: Aquarium Glass Cover Holder Material: Acrylic Color: transparent Uses: Used for all kinds of open fish tank, grass tank, and need heat preservation turtle or snake tank, pet glass tank. Single length: Approx. 4.5cm/1.8in Packing List: 1 Set x Aquarium Glass Cover Holder(4 pcs, 1 pcs cover holder has two screw.)