1.10 years experience 2. Certificate: ISO9001: 2008 3. Material: Carbide Bit Face Shape Selection: 1. Drop Center Bit 2. Concave Face 3. Convex Face 4. Double Gauge Face 5. Flat Face Bit Carbide Button Shape Selection: 1. Domed/Round Button 2. Parabolic/Semi-Ballistic Buttons 3. Ballistic Button 4. Sharp Button 5. Flat Button