The Spear & Jackson Metric Rafter Squares are multi-purpose triangular tools used to make the basic measurement and mark lines for marking out dimensional lumber, and as a guide for 45 and 90 degree cutting. Ideal for typical building, carpentry and renovating projects. Can serve as a saw guide, line scriber, ruler, mitre, framing square and protractor. Metric graduations plus Includes common conversion tables on the back face. Corrosion-resistant, strong, durable cast-aluminium alloy body. Anti-glare black matt finish. Overall Size: 260mm L x 135mm W x 20mm H