Description:   12 Inch 30cm Aluminium Tri Scale Metal Ruler Architect Engineers Technical Rule   Features:    Scale clear、 built-in scale 30cm long with a protective sleeve Scale accurate、 easy to carry. Excellent material、 durable and lightweight、 easy to breakage、 not easily deformed、 smooth lines; Tri-scale precision for drawing paper. Use just enough length、 high color contrast、 easy to read engraved number.   Specification:   color: as the picture shown Material : mental Weight: 82g Size: 30cm\/11.8" Shape: Tri                 Package includes:    1 x Tri-scale   Details pictures: