General description The Mini Electric Grinder Cordless Drill DIY Engraving Pen Machine is a versatile and portable tool designed for various engraving and grinding tasks. It is suitable for use on materials such as wood, stone, glass, ceramics, and more, making it ideal for crafts and detailed work. Technical specifications Power: 8W Voltage: 3.6V Battery type: 501550 rechargeable lithium battery Battery capacity: 300mAh Charging time: 30 minutes (80%), 60 minutes (100%) Collet depth: 25mm Clamping diameter: 3mm (compatible with 3mm grinding bits, reducer drills, carving knives, etc.) Motor speed: 1 speed at 5000 RPM, 2 speeds at 10000 RPM, 3 speeds at 18000 RPM Endurance: 1 hour or more unloaded at high speed Size: 16x120mm Color: Gray & Black Material: Plastic + Metal Compatibility and accessories Includes: 1 sanding pen, 1 box of sanding heads, 1 charging cable Installation No specific installation instructions provided; simply charge the device and attach the desired accessory for