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.