Corner poles, also called masonry guides or deadmen, help masons lay to a line without building corner leads. They are posts that are braced or fastened in a plumb position at the ends of a masonry wall. The line is stretched between the poles. Once a course is laid, the mason slides the line up the pole to the marking for the next course and begins laying the units again. Some proprietary poles are free-standing, while others must be attached to the building frame or a few courses of masonry. Some poles come from the factory with markings for each course of brick or block (both modular and non-modular are available).