1.Material: The combination bracket is made of high quality stainless steel and the corner frame is made of aluminum alloy, which is durable, lightweight and easy to carry. 2.Design Detachable: The precise combination square base and the ruler can be used separately. Hidden marking pin design is safer and prevents accidental injuries. It can be disassembled and assembled at will, and is convenient to use. 3.Double-sided ladder: The laser scale of the square combination measuring tools is clear and wear-resistant, anti-glare, and the double-sided scale is easy to read and use. 4.Multi-dimensional measurement: the bubble horizontal built-in combination square can measure objects horizontally, vertically and 45 obliquely. 5.Wide application: the professional measuring tool is widely used in various measurements in daily life, DIY manual , school education, professional carpenters, decoration industry, etc.