Typical load capacities are around 250 lb for many standard drawer rails; heavy-duty models can be rated up to about 500 lb.
Many drawer rails are side-mount designs and are described as compatible with most side-mount cabinets; several include adjustable side-mount screw slots to aid installation.
Many drawer rails use ball-bearing systems and nylon rollers or cushioning to provide smooth, quiet sliding with reduced noise and bounce.
Common cross-section measurements include a height around 0.77 inches and widths commonly around 2.09 inches up to about 3 inches, depending on length and model.
Many listings include mounting hardware and installation instructions; some also include screw-and-nut kits (for example, packs of 16 or 24) or a paired set of slides with mounting hardware.