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OCM Brand 2 PACK - Precision Laser Etched Engineer and Architect Triangular 3-sided Scale.Features a Durable Fade Resistant Solid Black Anodized Finish.Our 12-Inch Professional Quality Scales also have a solid-extruded aluminum body that is resistant to Flexing, Warping and all weather conditions.Concave Sides lie perfectly flat on the drawing surface. Easy-to-Read Laser Etched Imperial Engineer Increments 10,20,30,40,50,60 parts to the inch and Imperial Architect Increments 16, 1, 1/2, 1/8, 1/4, 3/32, 3/16, 3/8, 3/4, 1 1/2, 3. For Professional Applications, Architecture, Engineering, Drafting and Technical Illustration. WILL NEVER FADE or RUB OFF - Lifetime Guarantee