This screw extractor set is for 2.35mm shank grinding heads and works with electric grinding pens, ensuring alignment for screws on phones and laptops, suitable for various electronic device models. The wear resistant quickly damages the surfaces texture of screws, creating new stress points to avoid repeated grinding and protect device casings. Features a plug and play installation structure for fast grinding head replacement without extra tools. With three speed , it adapts to different screw conditions, improving removal efficiency. High concentricity design ensures stable operations without wobbling. Paired with fine grinding heads, it minimizes scratches and deformation on screw holes and casings during . Ideal for screws on phones, laptops, and extends to tablets, smart wearables, and other small electronics for repairs like chip grinding and screw .