The Rockler Perfect Fit Stair Tread and Shelf Gauge makes it easy for users to install or replace stair treads or stair risers, or to install shelves between two irregular walls. Just slide the gauge open till it fits in the opening, adjust the angle finders to lay against the walls, then use the gauge to transfer the angles and dimensions to your stair tread, stair riser, or shelf—no measuring required.

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