Wiktionary
wall chaser
n. A specialised hand-held power tool used for cutting narrow grooves in walls, for instance when laying electrical cable.
Wikipedia
Wall chaser
A wall chaser is a specialised power tool used for cutting narrow grooves in walls, for instance when laying electrical cable. The tool is usually powered by an electric motor which drives a pair of abrasive discs like those found in an angle grinder, positioned closely together.
Category:Grinding machines Category:Hand-held power tools