Fuhjythy USB Customizer Professional Engraving Pen 30 Bits Wood Glass and Plastic Portable Engraving Pen

3 speeds: 5,000 to 18000 RPM output makes the rotary tool more prominent. Three gear selection can apply to different situations precisely, and make your projects easier and more IMPROVED WIRELESS ELECTRIC GRINDER PEN: This grinding pen comes with rechargeable lithium battery, so you can use it anywhere. Clamping Diameter: 2.35mm (Suitable for all 2.35MM specification grinding head, reducing drill etc) Voltage: 4.2V Speed: 5000-18000r / min Dual Usage: Charging and plugging in dual usage, can be connected to the power supply while charging, more efficient., Manufacturer: Fuhjythy