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Operative masons used a variety of working tools within their trade. As freemasonry evolved, speculative masons adopted a number of these working tools to illustrate values and teach lessons of morality. The most common and well known working tools of speculative masons are the square, compass, 24 inch gauge, gavel, plumb, level, trowel, chisel, setting maul, pencil and skirrit. The latter four, the chisel , setting maul, pencil and skirrit are more frequently found in higher degrees or outside the United States but are not used within the American blue lodges. Each tool has an explanation and a lesson associated with it. The morals and ideals contained within these lessons constitute some of the core principles of freemasonry.