SD90 2UUL Stripped Screw Extractor Drill Set For Removing Damaged or Stripped Screws From Mobile Phones and Other Small Electronics. Material: The extractor bits are crafted from high-hardness carbide (tungsten steel), which provides exceptional durability and wear resistance. Function: The set is designed for quick and effortless removal of screws with worn-out or damaged heads. Compatibility: It is widely compatible with various small devices, including mobile phones, tablets, laptops, and watches. Design: The kit features an anti-slip design for secure handling and a dedicated fixing bolt mechanism for added stability during operation. Usage: The drill bits are used in conjunction with an electric drill or manual hand tools to first create a pilot hole and then use the extractor side in reverse to remove the screw.