1. Durable, practical and high strength. Convenient to use. 2. Function: quickly repairs damaged bolts and tightens the nuts. 3. Simplifies the repair process, no need to replace hard-to-find hardware accessories. 4. Easy operation. Use the lowest speed, then slightly apply pressure to remove the burr. 5. Suitable for all kinds of chuck drills. Effective on stainless steel, aluminum, copper, wood, fiberglass matters etc.