Design Their simple design and compact size make it easy to carry the tool in your tool bag. Quickly slip it into your hand drill and start fixing the parts. The operation is simple: use the lowest speed on the bit, then apply light pressure to remove the burr. Effective on stainless steel, hardened steel, mild steel, copper, brass, aluminum, fiberglass, wood, plastic. Fits size: 8-32 bolts (.164) up to 3/4 -10 (.750) - (4mm -19mm). Features: 1. Quickly repairs damaged bolts and retightens nuts in place. 2. Simplifies the repair process, eliminates the need for expensive or hard to find replacement hardware 3. Simple to use, using the lowest speed on the drill bit, then applying lightly pressure to remove the burr. 4. Effective on stainless steel, hardened steel, mild steel, copper, brass, aluminum, Fiberglass, wood, plastic. 5. Made of stainless steel, high strength and hardness. 6. Convenient to use and durable, save over 80% time. 1. Remove burrs, does not hurt hands and improves efficiency. 1. Any thread can be ground. 3. It is suitable for all types of chuck and meets different needs. Superior quality Top quality stainless steel Robust, strong and durable Reusable for long term use Features: Material: Stainless steel Color: Silver Use to deburr the external chamfer tool Compatible sizes: 8 to 32 bolts (.164) up to 3/4 '-10 (.750) - (4 mm -19 mm)