Scope of application: It is suitable for engraving, carving, -carving, stainless steel marking on all kinds of stone, wood, olive pit, plastic, egg carving, glass, ceramics, and other planes. Grinding and cutting can only be assisted. Note: Do not press the machine forcibly, use the machine speed to operate. Product Name:Mini Rechargeable Electric Grinding Pen Battery model:10400 rechargeable lithium battery Battery voltage:3.7V No load time:110 minutes Load for 60 minutes Product weight:65g Product speed:35000 rpm/min Colour:Silver & Gold Material:Metal Size:length 140mm width 12mm,Clamping handle diameter:2.35mm Package Contents: 1 * Engraving pen 2 * Screws 1 * Battery 1 * Grinding head 2 * Engraving head 1 * Wrench 1 * Charger Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. Scope of application: It is suitable for engraving, carving, micro-carving, stainless steel marking on all kinds of stone, wood, olive pit, plastic, egg carving, glass, ceramics, and other planes. Grinding and cutting can only be assisted. Note: Do not press the machine forcibly, use the machine speed to operate.