Using this high quality Quartet Radius Design magnetic changeable letter directory you can quickly and easily display directories, schedules or information for everyone to see. Set up, update and change postings quickly and easily with magnetic letters (sold separately). The Quartet Radius design changeable letter directory has shatterproof acrylic windows and locking doors to protect your postings. Plus, the contemporary radius-edge aluminum frame with graphite finish adds style and durability. It even includes a security-lock and mounting hardware to help prevent theft and vandalism.