There are two kinds of triangle rulers made in our company,angle of 90,45,45degree and 90,30,60degree. Thickness:8mm Length of 90,30,60degree:28.5/53/60mmLength of 90,45,45 degree:36.2/36.2/51.5mmQuality of wood is excellent.Price is very competitive. laboratory mathematic equipment, physic, chemistry, biology, ruler, chemistry, glassware, wooden triangle rulers