1. Makes feeding,maintenance and cleaning very easy. Easily adhered to surfaces. These hinges are easy to glue the lightweight aquarium with hot glue or silicone glue without drilling holes,so you don't have to lift the lid all the way off of the aquarium. Just open up the lid partially without having to take it off and feed the fish. And your turtle can't get out.2.Open and close smoothly. No squeak. The acrylic hinges will fold all the way back onto itself,allow you to open the cover from either side,and lay it completely flat on top of the other half of the cover. They can be bent in two ways. If you face in one direction,the hinges will lie flat on top of each other,and if you fold them in another way,there will be a groove at an angle of about 45 degrees.3.Strong. Holds up well to both moisture and moderate heat. Once the hinges are in place,they are sturdy. Needn't worry about them getting wet and rusting or discoloring or leaching into the aquarium water. This hinges nice to work with the removable hinge pin. Alignment is easily accomplished be removing the pins and inserting a rod through both hinges.4.Sturdy and no peel. The crystal-clear hinges are free moving with no slop/wiggle/wobble. Great for making hinged acrylic boxes. A nice-looking and ingenious way to attach hinges. Provide a frontside access to plastic storage showcases for car models. Suitable for DIY display stands,gift boxes,jewelry boxes,etc.5.Versatile,easy to work with,waterproof hinges. The clear acrylic hinges are lightweight. Suitable for building aquarium lids. Perfect for tarantula enclosures. Easy to weld to Plexiglas. They are sturdy and connect the pieces of cut greenhouse panels that make up the lid. Durable enough for hanging a plexiglass lid.