Features: The electric engraving pen delivers precisions polishing with advanced motor technology, offering stable power output up to 20000RPM for detailed works on mobile phone repairs and IC chip processing. Featuring plastic housing and interchangeable alloy polishing heads, this multi functional tool includes three adjustable speed settings for versatile cutting, engraving, and polishing tasks. Designed for mobile phone repair technicians, jewelry, and DIYer enthusiasts seeking professional control in delicate projects. Tackle intricate tasks like motherboard IC chip polishing, jewelry detailing, and miniature model crafting with its compact, portable design for workshops or on site jobs. Enhanced safety with ergonomic nonslip grip and automatic overheat protections ensures fatigue resistant operations during extended polishing across wood, metal, and plastic surfaces. Specifications: Component: Plastic,Alloy Size: 154mm/6.06''x16mm/0.63'' Maximums Speed: 20000RPM Package Includes: 1Piece Electric Polishing Pen 10Pcs Grinding Head note: Please allow 1mm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual color of the item.