To prevent sagging or movement of a line during masonry work, which tool is used?

The correct tool to prevent sagging or movement of a line during masonry work is the line pin. Line pins are specifically designed to secure the masonry line, which helps ensure that bricks or blocks are laid straight and level. By anchoring the line at both ends, line pins maintain consistent tension and orientation, preventing any sagging that could lead to misalignment of the masonry units.

Using a line pin is essential for achieving accuracy in masonry projects, ensuring that the structural integrity and aesthetic quality of the work are upheld. Other tools, such as a trowel or masonry saw, serve different purposes, like applying mortar or cutting materials, rather than securing a line to ensure precision in laying out the walls.