Jinquan's self drilling anchor bolt, including hollow steel anchor bar, steel drill bit or carbide drill bits, coupling, nut, plate and stopper etc., is a bolting solution for unstable ground conditions. Self drilling anchor bolt, R25N, R32L, R32N, R32S, R38N, R51L, R51N, T76N, T76S. 1. drilling bar self drill anchor bolt 2. self-drilling grouting 3. use in mine, hard rock, tunnel 4. R&T thread 5. accessories available 6. R25N-T76S Application: Tunneling Soil Nailing Mining Slope Stabilization Hydroelectric Station Civil Construction Other underground projects Welcome to visit our factory in China, and expecting to establish long terms cooperations with you!