These Swanson Brass Stair Gauges affix readily onto any standard rafter square – we recommend our Speed Squares – and both framing and builders squares making repeat cuts consistent and predictable especially with stairway work. All uniform layouts for angle cuts are easier with these stair gauges. Made from solid brass you will find multiple uses when measuring and a variety of building materials including drywall as these stair gauges are the ideal choice when working on custom stair installation projects.