a. Supporting Tools. Supporting tools consist of sawhorses or trestles used to support workers and materials. Figure 2-37 shows a pair of sawhorses, which you might use to support a piece of lumber that you are cutting.

b. Retaining Tools. Retaining tools consist of various types of clamps, which fall into the following general categories: C clamp, double-screw clamp, and bar clamp (Figure 2-38).

c. Vises. Vises can be fitted to the top of a workbench, and some are adapted to slide underneath the top of the workbench. Most vises used by carpenters are fitted with wood between the jaws to protect the work from scars, dents, and scratches (Figure 2-39).