An edge treatment tool having a vibratory mount to cause vibrating motion in a direction are used to treat metal edges extending in such direction. A resilient mounting may be used for the tool. The resilient mounting allows the tool to be vibrated by vibrators which oscillate with the tool or by vibrators which change length from a fixed to a resilient mount. The resilient mount is preferably provided by thin metal strips bendable about axes perpendicular both to the edge direction and to the application direction for the tool.