Ensure perfect rail-to-rail alignment, when mounting equipment in your server rack with these rack unit labeling strips Compatible with server racks and cabinets up to 52U in height Server rack unit label / Server rack unit sticker / Server rack unit tape / Rack U label / Rack U Sticker / U rack labeling tape Helps you visually align rack-mountable equipment during installation Cut-to-size U labels for your rack, up to 52U Hassle-free application with self-adhesive labels