The full extension drawer has been tested by professional testing institutions. The slide rail's opening and closing cycle exceeds 100,000 times, demonstrating its durability and a normal service life of over 30 years. Heavy-duty drawer slides: Size: 400mm - Installation thickness: 12.7mm (each) - Width: 50mm - Maximum load: 70kg - Total length: 81.3cm - Package contents: set of 2 (1 pair of rails) left and right. Mounting brackets and screws are not included. Removable and full extension drawer slides: There is a plastic buckle on the back of the inner rail, which can be removed by pressing and pulling. 3-fold rails allow the rails to be fully extended, smoothly and quietly, preventing collisions when pushing and pulling during use and reducing noise. Rust and corrosion resistant: It uses high-quality galvanizing followed by blue plating, which has high rust resistance and is durable. Tips: The metal parts are sharp during installation. Protect your hands. Gloves are recommended during installation.