It refers to a set of tools that are used in all drafting works or activities especially if the activity requires mechanical presentation.

These are sets of consumable items that are specifically used in drafting works or activities

It is used for drawing horizontal lines and serves as a guide for triangles when drawing other kinds of lines.

Its sole purpose is to reproduce the dimensions of an object in full size on a drawing or to reduce or enlarge them in regular proportion.

It is used for measuring and laying out arcs and circles as well as angles that cannot be measured with either the 45o or the 30o x 60o triangles.