Under mounted full extension steel ball-bearing action. Loads up to 88 lbscapacity.Easy to install. Made from high-grade cold rolled steel, zinc plated, steel construction full extension slides are rated for heavy-duty use, featuring soft-close functionality to close any drawer softly and silently. Our full extension hidden damping slides can be used in kitchen or bathroom drawers, office desks, or other personal storage areas, whether they have face frame or frameless construction. The slides are completely hidden beneath the drawers, showcasing the natural beauty of the drawers to the maximum extent. 【Ball Bearing Drawer slides & Detachable 】 Solid steel ball to ensure smooth opening and closing of the slides.The inner rail can be detached by pressing the buckle for easy installation.The rear end of the slide rail is equipped with a rubber mute pad, and the noise is as low as 35 decibels., Manufacturer: IMGASDCSD