Upgrade your cabinets with these high - quality 21 in. undermount drawer slides. Each set comes with 6 pairs, along with mounting screws and brackets. The slides are made from high - grade galvanized steel, ensuring durability and compatibility with most undermount drawers and cabinets, whether face frame or frameless. They are perfect for new construction or replacement projects. With a full - extension opening, you can access the entire drawer. The soft - close feature allows the drawer to close quietly and smoothly, rated for heavy - duty use with a load capacity of up to 75 lbs. The overall length is 21.4 in. (543mm), suitable for 21 in. deep drawers. The minimum cabinet depth required is 22.4 in. (569mm), and when using mounting brackets in face - frame cabinets, the maximum cabinet depth is 23.0 in. (584mm). The package also includes an adjustable locking device, rear mounting brackets, and installation instructions. Make sure to choose the right size and refer to the installation manual for best results. These slides will bring convenience and functionality to your daily life.