作業員が金てこを使って重い石を持ち上げた。
The worker lifted the heavy stone using a crowbar.
かなてこ is the native Japanese word for a crowbar, while バール is a loanword (from Dutch) used just as commonly for the same tool.
Most common spelling; uses 金 for 'metal' and てこ for 'lever'.
Katakana spelling, sometimes used in technical contexts or for emphasis.
Alternate kanji spelling using 鉄 (iron) and 梃 (lever).
Variant combining 金 and 梃.
Contains irregular kanji usage; 挺 is not standard for 'lever'.
Compound of 金 (kana, 'metal') and てこ (teko, 'lever'). The reading かな is an older form of かね (metal).