A Dera wall chaser is a type of electric wall-cutting machine used in construction to make clean grooves (channels) in walls for installing wires, pipes, or conduits.
Description of a Dera Wall Chaser
A wall chaser (including the Dera brand) is a handheld power tool designed to cut parallel slots in concrete, brick, or plaster walls.
It works similarly to an angle grinder but is more specialized and precise.