The Grainger website offers a variety of letter and number sets for facility identification and signage. These sets are available in different materials like plastic and metal, sizes ranging from 2 to 18 inches tall, and colors including black, white, red, green, blue and more. The letters and numbers can be used for labeling buildings, rooms, equipment, inventory, and more. Grainger offers durable options suitable for indoor or outdoor use that meet OSHA and ANSI standards. Customers can choose individual letters and numbers or complete sets.