Combination squares are multi-purpose measuring and marking tools They can be used as a: Square, for marking and referencing 90 angles and checking if surfaces are flat and square to one another Mitre square, for marking and referencing 45 angles, such as in woodworking for mitre joints Spirit level, to check is a surface is level or similarly if a surface or edge is plumb (vertical) Depth gauge or height gauge Form of marking gauge for marking lines parallel to an edge, by setting the head to a certain distance from the end of the rule Our PTI combination square guarantees accuracy as well as durability Metric and imperial graduations The strength and high corrosion resistance of aluminium ensures a product that will last a lifetime Aluminium precision machining and tight tolerances result in one of the best blade locks available Use the shoulder for a 45 angle Use the anvil for a 90 angle Accurate spirit level 300mm / 12 Stainless steel rule Brass marking scr