BR3 90mm DTH Bit - Convex Face Semi-Ballistic Button Rock Drill Bit The BR3 90mm DTH Bit is a high-performance Down-The-Hole (DTH) rock drill bit designed for efficient drilling in hard and abrasive rock formations. Featuring a 90 mm drilling diameter, convex face design, and semi-ballistic tungsten carbide buttons, this DTH bit provides a balanced combination of rock penetration, impact resistance, and wear performance. The BR3 90mm bit is configured with 6 × 14 mm, 4 × 12