Metal flat triangular-shaped straight edge. Used for making quick straight lines and angles. This one is 12 inches long on each side, but is unruled (no measurements marked).
Home Repair Resource Center
http://hrrc-ch.org/toollibrary/
2520 Noble Rd.http://hrrc-ch.org/toollibrary/
Cleveland Heights, OH, 44121
USA
(216) 381-6100