Combination Square Set, 12" 4R, PEC

Squares made by Product Engineering Corporation (PEC) made in the US are the industrial standard for precision and durability.

Made from a high-quality chrome-plated carbon steel which offers superior wear resistance and long-lasting, crisp graduations. Fully hardened, tempered and etched with precision.

A combination square consists of a steel rule (blade) and a sliding head that locks anywhere along the rule. The head typically has two reference faces: one at 90° for square cuts and one at 45° for miters. Many models include a bubble level and a scribe/awl for marking precise lines. The head slides along the rule and is secured with a knurled knob to maintain accurate measurements

Combination square with 12" machinist's blade, square/miter head, protractor head, and center head. 

4R graduations, 8ths & 16ths, 32nds & 64ths. Protractor graduated 0-180 degrees in both directions.

Heads have hammerstone powder-coat finish. Square/miter head includes level vial and hardened scribe tool.

The combination square was invented by Leroy Starrett (yes, that Starrett) in 1877. It's one of those basic tools that should be in every machinist's (and woodworker's) tool box.

The name combination square is truly appropriate for this tool, as it includes 7 basic components and can be used in hundreds of ways. In one package you get 90° and 45° squares, a protractor, a centering head, a precision scale, two levels, and a scriber.