7-in-1 Versatility: Functions as a try square, miter square, saw guide, line scriber, protractor, out-of-square corner angle finder, and stair layout square.

Heavy-Duty Construction: Die-cast from heavy-gauge aerospace aluminum alloy for job-site durability. It features a matte finish to prevent glare, with high-contrast, black-filled gradations for quick readability.

Scribing & Layout Features: Includes 1/4-inch spaced notches for smooth line scribing and a layout bar to simplify marking out stair stringers and rafters.

The "Little Blue Book": Comes complete with the iconic Swanson Blue Book of Rafter Lengths and Roof Construction, a pocket-sized 62-page guide packed with vital formulas, reference diagrams, and tables.