1. Instrument used to mark the first coat of stucco or plaster so that a gripping surface is formed for the second coat. 2. Powered roller which scores grooves into cured concrete by use of hardened steel cutters.
A piece of thin metal with teeth or serrations cut in the edge, used to roughen fresh mortar surfaces to achieve a good bond for the tile; a scarifier also can be used to roughen the surface of concrete.