INSIZE 4145-300 Granite Squares 300x300x300mm

The INSIZE 4145-300 is a granite square built as a 300×300×300mm cube with through-holes on more than one face. INSIZE states a squareness of 2µm and a combined parallelism-and-squareness figure of 4µm across its reference faces. Made of Indian granite, it resists the dimensional drift that temperature change and ageing cause in a metal square. Toolrooms and inspection rooms use it to check squareness, set up workpieces at a right angle, or as a precision reference block on a surface plate.