161PCS USB Mini Electric Grinder Drill Engraving Pen Grinding Rotary Tools SetDescription :Input voltage: 5V / 2A Output power: 30W Speed: 5000-15000r/min Clamping diameter: 0.5-3.2mm Size: about 168x25mm (Due to manual measurement, there will be an error of 1-3mm.) Suitable for: grinding, grinding, polishing, deburring, engraving, dust removal, drilling, etc.Note: 1.Due to manual measurement, please allow slightly different sizes. 2.Due to the difference of light and screen, the color of the item may be slightly different from the picture. Thank you for your understanding.Feature:1.SIMPLE 3 SPEEDS ADJUSTMENT: One button to switch rotation speed among 5000-15000r/min, which adapt to different working situation. 2.ENERGY SAVING: This electric drills powered by USB cable, which is eco-friendly, energy saving and convenient to use. 3.PORTABILITY AND CONVENIENCE: Provided with the overload protection, let the work become safe and reliable; Ergonomics handle is for comfortable gripping, use anywhere anytime. 4.VARIETY OF BITS ASSORTMENT: The accessories helps do different work like drilling holes, grinding, graving and others. 5.Applicable to stainless steel, porcelain, stone, glass, plastic, wood, bracelet, etc.Package Including:161pcs tool sets