C.K Tools T3590 Rafter Square 180 mm Aluminium Speed Square

Carpenters, roofers and framers use the C.K Tools T3590 Rafter Square for fast, accurate layout of common, hip and valley rafters. The 180 mm aluminium body is light enough for all-day use, while the thick base edge works as a saw guide for straight cuts. Laser-etched markings stay readable after heavy use, and the anodised finish resists corrosion on damp sites.

Key specifications

• Tool type: Rafter square (speed square)
• Measurement system: Metric
• Blade length: 180 mm
• Material: Aluminium
• Angle scale range: 0–90 degrees
• Common rafter scales: Yes (hip, valley, common rafters)
• Scribing notches: Yes
• Saw guide edge: Yes (thick base)
• Marking type: Laser-etched
• Finish: Anodised
• Corrosion resistance: Yes
• Accuracy: High precision
• Integrated protractor: Yes
• Edge type: Straight edge
• Colour: Silver/grey

Why choose it

The T3590 combines a protractor, try square and rafter square in one tool. The laser-etched graduations are crisp and permanent, and the anodised aluminium body withstands knocks without bending. The thick base edge gives you a solid guide for a circular saw, so you can cut straight from the layout line.

Ideal use cases

• Laying out rafters for roofs and dormers
• Marking square and angled cuts on framing lumber
• Checking and transferring angles up to 90 degrees
• Guiding a circular saw for straight crosscuts

Good to know

The square is metric only, with a 180 mm blade length. It is designed for carpentry and roofing work, not for precision machining. The anodised finish keeps the surface smooth and corrosion resistant, but the tool should be wiped dry after use in wet conditions.