The gypsum cutter at an angle is used for processing and shaping the edges of gypsum boards. Two types of knives have a special way of use. The square blade can be cut at an angle of 45 degrees. The trapezoidal adjusting blade can cut at an angle of 22.5 degrees. Four gypsum board thicknesses can be installed: 9.5mm, 12.5mm, 15mm and larger than 15mm.