The Silverline Heavy Duty Combination Square has a die-cast aluminium body with a hardened steel blade. Built-in spirit level with scriber, clear metric and imperial graduations and an accurately milled face as well as a knurled adjustment screw. Used for measuring and checking 45° and 90° angles as well as measuring depth, finding a centre or an angle, marking up long lines, positioning workpieces, setting bits and blades and as a standard ruler or spirit level.