Alvin - Bevel Flat Engineer Scale - 12 inch - Alvin Bevel Flat Architectural Scales are four-bevel white scales made of high-impact plastic in 6 inch and 12 inch lengths. Printed graduations. Supplied in vinyl sheath. 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.