Features:  Compact size, lightweight and portable, cordless design for easy operation.  Elegant and exquisite appearance design, streamlined design fully reflects the concept of ergonomics.  Stainless steel and copper body, solid and firm, practical and can provide high working efficient.  6mm diameter, compact structure, which is convenient to do detailed engraving.  The chuck adopts high-speed bearings to stabilize high-speed frequency, with stable working performance.  Sensitive contact switch design, starts/stop at touching, more convenient operation.  Adopts 10440 rechargeable lithium battery, do not need to change battery very often.  The traditional system with a superior shake absorption structure with fine grip feeling and low noise.  Widely applications, perfect for carving glass, wood, egg, peach pit and metal lettering.    Specifications:  Name: Electric Grinding Pen   Material: 304 stainless+copper  Battery: 1 * rechargeable battery, 3.7V, 1000mAh (included)  Hold diameter: 2.35mm  Speed: 35000r/min  Item size: 140 * 12 * 12mm / 5.51 * 0.47 * 0.47in  Pen weight: 65g / 2.29ounce  Package size: 195 * 195 * 45mm / 7.68 * 7.68 * 1.77in  Package weight: 300g / 10.58ounce    Packing List:  1 * Electric Grinding Pen   1 * Recharging Base  2 * Silicone S-leeve  1 * Wrench  2 * Replacement Heads  1 * Fastening Screw  1 * Guideline