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Master Squares 

Master Squares are ideal for inspecting X, Y, and Z axes of machine tools.  Very stable and rigid, they provide the ultimate in squareness references.  These squares have 5 finished faces, with 1 large face and 4 edges finished flat, square, and parallel in either laboratory grade or inspection grade (0.00005mm).  All six faces can be finished upon request. Sizes are available from customers’ requests.