Hand wrenches for tightening or loosening nuts are of several forms, some of which are shown in Fig. 212. The wrenches shown are designated as follows:

(1) Monkey wrench (adjustable).

(2) Pocket wrench (adjustable).

(3) Spanner wrench.

(4) Socket wrench.

(5) Double-end, straight, open, hexagon wrench.

(6) Double-end, " S," open, square wrench.

(7) Double-end, angle, open, hexagon wrench.

(8) Single-end, closed wrench.