To install, set your mirror into the upper clips, extending them. Then just seat mirror into the lower clips. Each set of mirror clips consists of two upper and two lower clips, plus four mounting screws.
NOTE: Maximum recommended mirror size is 36" x 48" (914 x 1219 mm).
Upper Clips: Have unique, spring-loaded flanges. You just expand these clips during installation – it's quick and easy!
Lower Clips: Always remain stationary, and have a 5/16" (7.9 mm) channel space. These clips are not spring loaded, and are designed to carry the mirror's weight.