Durable Material: The 7inch carpenter square triangle ruler is made of aluminum alloy(red/silver)/carbon steel(dark grey) rust resistance and durable not easy to break long service time. High Accuracy: Accurate carpenter square accurate measuring and marking High accuracy engraved markings for visibility and durability easy to read and reduce parallax errors. Detachable Design: Detachable level base triangular ruler level base short ruler can be combined or used alone for more functions. Widely Application: Versatile carpenter square great for measuring marking and drawing accurate angle draw various straight lines parallel lines horizontal lines vertical lines draw a circle find the center point of the circle and measure the depth (within 10cm/4inch). Easy Carry: Great for carpenters engineers lightweight portable and easy to store in your work pouch or tool bag. Specification: Color: Red Silver Dark Grey Red Silver Material: Aluminum Alloy Dark Grey Material: Carbon Steel Total Size(Left hypotenuse length x Right hypotenuse length x W): About 198x197x278mm/7.8x7.76x10.94inch Aluminum Alloy Thickness: About 3mm/0.12inch Carbon Steel Thickness: About 2.2mm/0.09inch Level Base Thickness: About 18mm/0.71inch Package includes: 1pc x Carpenter Square Note: 1. Due to the light and screen difference the item's color may be slightly different from the pictures. 2. Please allow 1-2 cm differences due to manual measurement.