Alvin SST18 stainless steel drafting T-square. Professional Alvin T-square features a 1.5" wide x 1.2mm thick spring-tempered stainless steel blade. Graduations using highly-durable UV-cured black ink are calibrated in 8ths and 16ths. Include two scales: top edge in inches with 1/32" divisions; lower edge in picas and points (6 and 12 pt.). Black finished cast aluminum fixed head is 11.5" wide and securely riveted to blade. Perfect T-square for graphic artists, architects, drafters, framers, printers, signmakers, and more. Precision-made for accuracy, durability, and longevity. 18" Alvin stainless steel T-squares.