rock drill

Synonyms:

bore bit, borer, stone drill

Types:

cross bit

a rock drill having cruciform cutting edges; used in mining

star drill

a steel rock drill with a star-shaped point that is used for making holes in stones or masonry; it is operated by hitting the end with a hammer while rotating it between blows

straight flute, straight-fluted drill

a rock drill with flutes that are straight

Type of:

drill

a tool with a sharp point and cutting edges for making holes in hard materials (usually rotating rapidly or by repeated blows)