API Self Drilling Anchor Rock Drill Rods with Forging Type Carbide Material

API Self Drilling Anchor Rock Drill Rods with Forging Type Carbide Material R51N Self Drilling Hollow Anchor steel for tunnel construction Slope Stabilization Introduction The Self Drilling Anchor (SDA) is unique anchoring system and fulfills current and increasing demands of thetunneling industry and ground engineering for safer and faster production. The system provides advantages for all areas of its applications, where boreholes would require the time consuming drilling