Hand tools with fixed or variable openings, used for tightening and loosening nuts and bolts, and for assembling and disassembling objects.
open end wrench
Wrench with two openings of different sizes, each having parallel jaws.
flare nut wrench
Wrench with two many-sided heads, designed mainly to tighten plumbing joints.
combination box and open end wrench
Wrench with one forked end and one many-sided head, both ends are the same size.
box end wrench
Wrench that is usually bent and has two many-sided rings of different sizes; it grips the nut more firmly than the open end wrench.
ratchet box end wrench
Wrench whose rings are fitted with a pawl, which limits the part’s rotation in one direction, and a ratchet, which can be rotated in the opposite direction without loosening the grip.