Granite Master Square

We are offering gmt granite master squares are used for direct checking of perpendicularity, squareness and straightness, for calibrations of cmms, machining centres etc. The plates are made of black granite of different sizes to meet customer requirements. All granite cubes of four sides are lapped to accuracies as requested by the customer.
gmt 6-face granite master squares are ideal for accurately checking the x-y-z axes on cnc machine tools and coordinate measuring machines.
with the square in the horizontal position, the x and y axes can be checked for 90° squareness. With the square in the vertical position, tracing along the vertical edge of the square can check the perpendicularity of the z axis. By tracing along the top edge of the square while in the vertical position, it will check parallelism of the table in the x and y axes.