IRWIN Tools Rafter Square, Hi-Contrast Aluminum, Blue, 7-Inch (1794463) by Amazon.co.uk

• This professional tool has permanent deep stampings are durable. The aluminum body is rust-proof and weather-resistant

• The square has multiple scales: 1/8-, 1/10-, 1/12-, and 1/16-inch

• Features rafter tables, brace and octagon scales and Essex board measure

• Yellow markings on blue background are easiest to read