These custom sliding shelves are amazing.  I followed the detailed instructions in the product description for measurement—a must because the shelves are custom built for you.  The shelves come assembled and with a template for installing them.  You simply screw in the rails and mount the shelves on the rails and voilà!  Your kitchen cabinet is transformed!  I am so happy every time I have to get something out of my cabinet.  I no longer have to shuffle all the contents and pull out everything to get to one item in the back.  Even my husband declares that he is living in luxury each time he pulls out the shelf for easy access.  I just bought two shelves as a trial, but I’m planning to get more!