Feature:1. MULTIPLE USAGES: 3.7V cordless rotary tool kit, portable pen type design for sanding, engraving, polishing and cleaning etc., suitable for home and craft projects.2. 5 VARIABLE SPEEDS: The grinder pen has 5 variable speeds, 3600r/min, 8000r/min, 12000r/min, 15000r/min, 18000r/min, suitable for different DIY work situations.3. USB AND BATTERY: The tool supports charging with DC 5V USB connector, and equipped with a 1000mAh large capacity battery, suitable for long term operation.4. OTHER PARTS: Equipped with abrasive rings, chucks, grinding rods, cotton wheels, saw blade, twist drills and connecting rod, etc., this set is convenient and practical.5. EASY OPERATION: The electric grinder pen is small and compact, easy to operate, ready to use after installing the grinding head, has a wide range of applications.Specification:Item Type: Cordless Rotary Tool KitMaterial: ABSVoltage: 3.7VGear Speed: 3600r/min, 8000r/min, 12000r/min, 15000r/min, 18000r/minPower Supply Battery: 1000mAh Li ion battery (built in)Charging Voltage: DC 5V.Package List:1 x Electric Grinder Host1 x Charging Cable12 x Sand Rings5 x Collets5 x Grinding Sticks2 x Cotton Wheels1 x Small Circular Saw Blade3 x Connecting Rods2 x Grinding Needles (Random Style)3 x Twist Drills1 x Storage BoxNote:Different tool accessories fit different collets. If the tool attachment tends to come off the head of the rotary tool, replace it with a new collet to fit it.