tappet wrench(n = noun.artifact) open-end wrench - a wrench having parallel jaws at fixed separation (often on both ends of the handle);
is a kind of spanner, wrench
has particulars: s wrench

adjustable wrench, allen wrench, alligator wrench, box end wrench, box wrench, brace wrench, bulldog wrench, carriage wrench, chain wrench, crescent wrench, dog wrench, hook wrench, lug wrench, monkey wrench, open-end wrench, pin wrench, pipe wrench, s wrench, screw wrench, socket wrench, sparkplug wrench, stillson wrench, tap wrench, tappet, tappet rod, torque wrench, tube wrench, wrench