ITEM NAME:DIY Electric Engraving Engraver Pen Carve Tool For Jewelry Metal Glass Kit Description Specification: Brand new Battery Voltage: 4. 2V Battery Capacity: 600 mAh Clamping Range: 0.5~3.2mm Rated Speed: 15000r/min Gear Adjustment: 3 gears adjustable Electric Grinder Size: approx. 145*30mm Feature: Powerful motor, spindle lock, high precision chuck. Three speed adjustments, one-key switching. Speed regulation to meet different work needs. USB charging. Used for carving, cutting, polishing, punching, rust removal, polishing. Fine workmanship and good performance. Easy to use. Durable in use. Package included: 1 set x Engraving Tool Note: Please allow 0-1cm size errors due to manual measurement. Item color displayed in photos may be showing slightly different on your computer monitor since monitors are not calibrated same..1 set x Engraving Tool. Electric Grinder Size: approx. Powerful motor, spindle lock, high precision chuck. Used for carving, cutting, polishing, punching, rust removal, polishing. Battery Capacity: 600 mAh.