rock drill; jackhammer; pneumatic drill
A heavy tool that drills into rock or concrete, often powered by compressed air.
The sound of a jackhammer echoes at the construction site.
They use a rock drill to bore holes into the bedrock.
Standard kanji spelling.
Mixed kana-kanji spelling, sometimes used for readability.
Rarely used kanji form; the first character is uncommon.
Compound of 削 (saku, 'cut, shave') + 岩 (gan, 'rock') + 機 (ki, 'machine').