The SUBURBAN P-06025075-M Four Way Parallel is the ideal tool for checking the accuracy of your angles. It can be used in various types of jobs, including machining and metalworking. The box parallel has a length, width and height of 6 in., 1/4 in. and 3/4 in. respectively. This square is ground to an accuracy of +/-0.0001" or better, so you can rest assured that it will do its job well. This steel tool also has a total length, width and height of 6in., 1/4in. and 3/4in.. With 0.0004" squareness and 0.0001" parallelism capabilities, this square can be relied on for accurate measurements time after time. If you need a tool that is reliable as well as precise, look no further than the SUBURBAN P-06025075-M Four Way Parallel.