21cm 60Degrees Metric Professional Aluminium Aluminum Metal Set Square Triangle Dimensions: 24cm (hypotenuse) x 21cm (scale to 19cm) x 12.1cm , 60 degrees. Thickness: 2mm. Made from silver, anodised aluminium. Precise mm graduated scale. High quality, durable set square for professional applications: technical drawing, art, craft, engineering, architecture. Brand new item supplied in original slide-in wallet for protection against scratches and easy storage.