Product Description: Quantity: 2 pieces Material: Stainless steel Color: Silver Use for Deburring External Chamfer Tool Compatible Sizes: 8 - 32 bolts (.164) up to 3/4' -10 (.750) - (4mm -19mm) Design Their simple design and compact size make it easy to transport the tool in your tool bag. Quickly slip it into your hand drill and start repairing parts. The operation is simple: use the lowest speed on the bit, then apply light pressure to remove the burr.< /p> 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 tightens nuts in place. 2. Simplifies the repair process, eliminates the need for expensive or hard to find replacements 3. Simple to use, using the lowest speed on the bit, then applying light 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 more than 80% time. Description: 1. Remove burrs, do not hurt hands and improve efficiency. 2. Any thread can be ground. 3. It is suitable for all types of chucks and meets different needs.