Professional Alvin stainless steel drafting T-squares feature a 1-1/2" wide, spring-tempered, stainless steel blade. The strong, durable cast-aluminum, fixed head with ebony black finish is secured by four pre-set flat-head screws. Perfect T-square for graphic artists, architects, drafters, framers, printers, signmakers, and more. Available in several popular sizes. Alvin PLAIN, UNGRADUATED (no measurements, plain blade edges) stainless steel T-squares.