also: かにめレンチ
noun
adjustable pin wrench; adjustable pin spanner
A wrench with two adjustable pins that fit into holes on a nut or collar; used for lock rings, bearing nuts, and similar fasteners.
自転車のハブを分解するときは、カニ目レンチが必要です。
When disassembling a bicycle hub, you need an adjustable pin wrench.
このカニ目レンチはピンの間隔を変えられるので、いろいろなサイズのナットに使えます。
This adjustable pin wrench can change the pin spacing, so it can be used on nuts of various sizes.
Compound of カニ目 (crab eye, from the two pins resembling crab eyes) and レンチ (wrench).