aluminum rafter square
Photo: Francesco Mosto
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Rafter Square (for angles)

Best for: Measuring angles on rafter pitches, stair slopes, and miters.

Look for: Aluminum square; markings for angles as well as roof pitch (expressed in whole numbers 1 to 12).

Shown: 12-inch Speed Square with layout bar and stop bolts (not shown), from Swanson Tool Co.; about $19;
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