Alvin S/S18 stainless steel drafting T-square. Professional Alvin T-square features 1-1/2" wide, spring-tempered, stainless steel blade. 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. Alvin 18" PLAIN, UNGRADUATED stainless steel T-square.