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.
