The Hultafors Professional Try Square comes with a 1.5 x 45mm stainless steel blade, and has millimetre graduations on the upper and lower edges of the blade.Graduations are deeply etched and are highly resistant to wear. Its anodised aluminum stock features an 18mm wide milled working surface. Specifications:Length: 300mm (12in).Blade Size: 1.5 x 45mm.Tolerance: ±0.03 degrees.