I have these wrenches that someone told me are Lineman wrenches. They are too thick (.200)for tappets and too thin for mechanics. \
Looks like ordinary 'slim' double end wrench. Some just call any slim wrench a 'tappet' wrench as it describes the thin access required.
Have a set of thin open end, and they are handy in spots, or to double up when placing a hex nut on top to add a lock nut for safety.
Had known Lineman's pliers, with cutter edge and hammer end, but never Linesman wrench
Forty years in the telephone business....believe me, I know what a "lineman's wrench" is....
A lineman's wrench is a heavy, double ended affair with different sized square openings designed to tighten the square headed nuts on utility poles. Each opening is stepped, so that you actually have four sizes at your disposal. Also called a "lag wrench", it's a brutal, heavy duty tool for constant use.
Google Klein tools and you'll get several images.
Try Alloy artifacts: http://home.comcast.net/~alloy-artifacts/index.html
Thanks Ken "Neat Site" I found them, they are Duro-Chrome thin wrenches