Building or fixing a keyboard tray? These UTALIND slides make it easy. They're a pair of 14-inch, ball-bearing slides made from cold-rolled steel, so they're strong and resistant to rust. Each slide can hold up to 25 pounds, which is more than enough for a keyboard and mouse, maybe even a small laptop. The ball bearings make the glide super smooth and quiet - no jerky movements or loud scraping. The package includes the two slides plus four mounting brackets and all the screws you'll need for installation. The brackets have multiple adjustment holes, so you can fine-tune the height of your tray. To install, you just attach the slides to the sides of your keyboard tray, then screw the brackets to the underside of your desk. They work great for office setups, home workstations, or even in workshops or kitchens for pull-out shelves. The silver finish is clean and unobtrusive. A simple, affordable solution for adding a sliding tray to almost any desk.