Fill in each blank space with the missing answer Choose from: flat, straight lines, service markers, strings, fixed. The like construction ink markers and ink pots, chalk lines and leveling strings are used. The ink markers and ink pots are used to draw and draw a straight line horizontally or vertically with one point of the thread as a point. A chalk line or chalk box is a tool for marking long, straight lines on relatively surfaces, much farther than is practical by hand or with a straightedge. They may be used to lay out straight lines between two points, or vertical lines by using the weight of the line reel as a plumb line. Levelling are used for levelling across longer distances