Accud 150mm Wide Base Machinist Square AC-845-006-02The Accud Wide Base Engineer Square is ideal for everyday workshop use and woodworking applications. The squares have accurate right angles both on the inside and outside, and ensure straightness and parallelism. SPECIFICATIONS Squareness(a): 33 m Squareness(): 35 m Base Height: 25 mm Base Width: 16 mm Blade Thickness: 3 mm Base Length: 100 mm WEIGHT: 0. 46 Kg