A reversibly locking assembly for use as a stethoscope holster or for use with other devices. The assembly includes a clip adapted for attachment to an article of clothing wherein the clip has a clip channel wherein the clip channel includes an upper section and a lower section wherein the lower section is wider than the upper section. A stethoscope connector is provided which is adapted for attachment to a stethoscope. The stethoscope has a tube and when the tube is aligned with the clip channel the asymmetric plate passes through the upper section. When the tube is not aligned with the clip channel the asymmetric plate does not pass through the upper section.
