Features: Woodworking protractor, woodworking marking tool, High Precision Layout Measuring Tool for Engineer Carpenter. Anodic aluminum oxide treatment, which not only ensures a beautiful appearance but also has certain oxidation resistance. The square protractor helps you draws perfect horizontal lines while sliding the rule along the edge of your work. There is no need to reverse the body when measuring, just slide to mark the right and left 45/90 degree angle. Aluminum alloy L-shaped splint, strong & durable, light material & high strength. Specifications: Material: Aluminum Alloy Size: approx 102x79x110x35x85mm/4x3.1x4.3x1.4x3.3in Color: red/blue Package Includes: 1x for Triangle Ruler note: Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item.