メガネレンチ

め

が

ね

れ

ん

ち

Meanings

1

box wrench; ring spanner

usually written using kana alone

A wrench with a closed, ring-shaped head that fits over nuts and bolts. Common in automotive and mechanical contexts.

You need a box wrench to remove this bolt.

スパナ
スパナ is an open-ended spanner (adjustable or fixed), while メガネレンチ has a closed ring head that grips more securely.
ソケットレンチ
ソケットレンチ uses interchangeable sockets, whereas メガネレンチ is a single-piece tool with a fixed ring opening.

メガネレンチ
kana-only spelling
Katakana spelling is standard; the word is usually written in kana.
眼鏡めがねレンチ
Kanji spelling exists but is less common; 眼鏡 means 'glasses', referring to the shape of the wrench head.
めがねレンチ
Hiragana spelling is also used.

Compound of 眼鏡 (megane, 'glasses') + レンチ (renchi, from English 'wrench'), named for the glasses-like shape of the ring head.