Alvin - Aluminum Triangle - 45/90 degree - 10 inch - This lightweight, durable Aluminum Triangle by Alvin has a matte-satin finish that resists stains and tarnishing. Features1/16 inch graduations on the 90 degree angle. May also be used as a template for circles from 1/16 inch to 1-3?8 inch. 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.