Feature: 1. [Combination Square] The combination angle ruler allows for easy marking and quick positioning, simple to operate, suitable for various projects. 2. [360 Degree Rotation] This combination ruler can rotate 360 degree, allowing comprehensive angle measurement and marking, both internal and external angles can be measured. 3. [Aluminum Alloy Construction] The angle disc is made from aluminum alloy, integrally formed with fine workmanship, resistant to falling, wear and erosion. 4. [Tightening Nut] The combination ruler features a freely adjustable nut design, allowing for easy movement of the ruler for measurement. 5. [Dual Scale] The sliding combination angle ruler features dual scales of metric and imperial system, clear and easy to read, hard wearing and lasting. Specification: Item Type: Combination Square Material: Aluminum Alloy Ruler Thickness: Approx. 2.5mm / 0.10in Angle Disc Thickness: Approx. 36mm / 1.42in Length: Approx. 500mm / 19.69in Color: Black. Package List: 1 x Combination Square