TM 9-243
TYPES AND USES - Continued
CROWFOOT WRENCH
The crowfoot wrench is an open-end wrench head
which is turned with a socket handle. It is used to remove
and/or install nuts or bolts. It is also used where an
obstruction would prevent the use of a regular socket.
PLUG WRENCHES
There are three basic types of plug wrenches, the bar-
type, the multiple plug wrench, and the socket-type.
Plug wrenches are used to remove and/or install drain
plugs.
Bar-type plug wrenches may be either square or hexa-
gonal and are about two inches long. A combination
wrench or socket must be used to turn the plug.
HEX KEY WRENCH (SHORTER SECTION)
The multiple plug wrench combines several plug ends
on a common handle.
The hex key wrench is an L-shaped, six-sided wrench.
Both ends of the "L" are the same size so you can turn
the wrench either to gain access to the screw head or to
obtain a leverage advantage. The hex key wrench is
used to remove and/or install hex head screws.
Socket-type plug wrenches are usually combined in
sets with an assortment of handles. The set will contain
several sizes.
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