Aosite, since 1993
For heavier drawers, or for a more premium feel, ball-bearing slides are a great option. As suggested by their name, this type of hardware uses metal rails—typically steel—that glide along ball-bearings for smooth, quiet, effortless operation. Most of the time, ball-bearing slides feature the same self-closing or soft-closing technology as high-quality door hinges to prevent the drawer from slamming.
Drawer Slide Mount Type
Decide whether you want a side-mount, center mount or undermount slides. The amount of space between your drawer box and the cabinet opening will affect your decision
Side-mount slides are sold in pairs or sets, with a slide attaching to each side of the drawer. Available with either a ball-bearing or roller mechanism. Require clearance – usually 1/2" – between the drawer slides and the sides of the cabinet opening.
Undermount drawer slides are ball-bearing slides that are sold in pairs. They mount to the sides of the cabinet and connect to locking devices attached to the underside of the drawer. Not visible when the drawer is open, making them a good choice if you want to highlight your cabinetry. Require less clearance between the drawer sides and the cabinet opening . Require specific clearance at top and bottom of cabinet opening; drawer sides typically can be no more than 5/8" thick. Space from underside of drawer bottom to bottom of drawer sides must be 1/2".