Electric Micro Engraving Etcher Engraver Pen, Mini Engraving Tool Kit, Adjustable Speed Carve Tool Set, 6 Polishing Head, 8 Stencils, 30 Bits Scriber Etcher for DIY Metal, Jewelry, Wood by AODOORFUNCTIONAL VERSATILE The scriber etchers of AODOOR electric micro engraving pen can drilling holes, grinding, graving and others. Also there are other 6 different style polishing heads with sanding ring. And other 8 unique Stencils suit all your needs from fine lines to deep grooves witch that can helps you polish and complete any engraving more quickly and easily. STEPLESS SPEED From 3,000 to 20,000 RPM (revolutions per minute). AODOOR micro carving