What is a wrench used for?

A WRENCH is used to GRIP and TURN nuts, bolts, and other threaded fasteners. ASVAB Shop Information tests hand tools. Types: OPEN-END (open jaws, two sizes); BOX-END (closed loop, grips all sides of a bolt head); COMBINATION (open one end, box the other); ADJUSTABLE/crescent (adjusts to fit different sizes); SOCKET wrench (with a ratchet, for speed); ALLEN/hex key (for hex-socket screws); PIPE wrench (for pipes). The right wrench grips the fastener securely to apply turning force. Knowing wrenches grip and turn fasteners (and the common types) is commonly tested.