Feature: 1. 3 Gear Adjustment: This grinder pen features 3 gear adjustable from 6000 to 15000RPM, you can make replacements according to your actual needs. 2. Excellent Performance: This grinder pen has an ultra accurate concentricity, faster work efficiency, it can provide you with excellent performance! 3. Multi Use: This detail grinder pen can be used for parts grinding, modification drilling, nozzle grinding, DIY, etc. 4. Portable: Comes with a small size and lightweight as well, you can easily take this grinder pen with you to help with your work. 5. Complete Accessories: Comes with sanding papers, polishing materials, this grinder pen can be used for a long time, take it with confidence! Specification: Item Type: Electric Grinder Pen Material: Plastic Battery Type: Lithium battery Length: Approx. 150mm / 5.91in. Package List: 1 x Electric Grinder Pen3 x Drill Bit3 x Sanderpaper Ring 2 x Polishing5 x Copper Chuck 4 x Liner Bar 5 x Grinding Stone 1 x Steel Cutting Disk1 x Shot Head Grinding 1 x Storage Box 1 x USB Cable