Good quality: the straight ruler is made of high quality aluminum alloy materials, the corner frame is made of zinc alloy, never rust, not deform, thickness is 2mm , strong and durable for long-term use. High-precision workmanship: Adopt laser technology for high-precision workmanship, double-sided ruler in mm and cm graduations. Embossed graduation for easy reading and durability. Multifunctional: This combination square tool is practical and designed for drawing straight lines, drawing parallel lines, laying out, calibrating, measuring the bit depth of the router, set table saw blades. Multi-dimensional measurement: the woodworking square can achieve horizontal measurement, 90 angular measurement, 45 degree angular measurement, and can be used as a bevel at 45 degrees, height or depth measurer. With adjustable square head: Consists of a 300mm straight ruler and an adjustable square head for precise measurements. Helps you make precise angles and lines with the ruler and head. Note: The data are manual measurement, please allow a 1-3cm error, due to the differences between the light and the display, there will be a certain color difference, the specific received in kind prevail.