●100% brand new and high quality. ●Used for right angle measurement, it can measure the vertical deviation of the inner and outer corners of the workpiece, and can also be used for assembly and platform work. ●Generally made of 45 medium carbon steel, the body is of quenching and heat treatment which make it more durable. ●The surface is of grinding, polished or galvanized, it can provide accurate measurement. ●Especially suitable for workshop workers to produce self-tests in peacetime