Professional Aluminium Aluminun Metal Metric Set Square Triangle 21cm 45 Degrees Professional Aluminium Metal Metric Set Square Triangle 21cm 45 Dimensions: 21cm (hypotenuse) x 14.8cm (scale to 13.5cm) x 14.8cm , 45 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.