Self Drilling Grouting Tunnel Left Thread Rock Anchor Bolt 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!