This combination square set includes a 7-inch and 12-inch tool for workshop and jobsite framing, rafter work, and trim layout. The 12-inch hardened steel blade features a rust-resistant finish with 1/8-inch laser-etched graduations and a 1.5 mm/m spirit level. The anodized aluminum base includes a built-in metal scriber and a knurled-nut lock for steady marking. The tools feature common, top cut, and hip-valley rafter tables along with a 5-80 degree pivot-degree scale for roof framing. The base sits flush against workpieces for straight or 45-degree lines. A bonus keychain level is included with the set.