The Vibro-Graver makes permanent markings on almost any surface. Mark hard and soft metals, steel, glass, stone, wood, or use it for engraving on gold and silver jewelry. Vibrating engraving tools have long been popular for creating background effects on jewelry. The Vibro Graver operates at 7200 strokes per minute. A stroke adjustment dial governs the depth of engraved marks. Furnished with tungsten carbide tip and 2 templates. 110 volts.