Helix Professional Engineer's Triangular Scale
12.0" Length - Aluminum - 1 Each - Silver
Triangular scale is designed for professional engineers with three color-coded, rubber, center strips for easy identification of scales. 12 scale is fully divided in three with 10, 20, 30, 40, 50 and 60 parts markings to the inch. Triangular scale is made of aircraft-grade aluminum."