Alvin - Professional T-Square - Stainless Steel - 30 Inch - The Professional Stainless Steel T-Square by Alvin features a 1.5 inch wide spring-tempered stainless steel blade. Black graduations include two scales: top edge in inches with 1/32 inch divisions; lower edge in picas and points (6 & 12 pt.). The Professional T-Square has a black finished cast aluminum fixed head that is secured by four pre-set flat-head screws. Alvin is one of the primary sources for drafting supplies and drawing equipment in the country. Creative Coldsnow is a pround retailer of Alvin graphic arts, drafting and fine arts products.