The built-in spring fingers in these holders store a compact disc, audio cassette or DVD against an end lip until you press the case in (and slightly up) with your finger. It then pops out just enough for easy removal. Sold as pairs (one right and one left rail). Screw mounted, they can be used horizontally or vertically. The CD rails hold 20 single CDs; each rail is 6 1/4" × 12 1/2". The audio rails hold 14 cassettes; each rail is 3 3/8" × 12 1/2". The DVD rails hold 16 movies; each rail is 6 1/8" × 12 1/2". Our best holders.