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Split Sets bolt is especially designed by GSI used together with dome plate for reliable ground support in hardrock mines, tunnels and slopes etc. Features: (1) Rollformed from high strength steel band with one end tapered tip for easy insertion into a drill hole, the other end has a welded ring for holding the bearing plate. (2)Provide immediate ground support in radial and axial direction, not suitable for very soft strata and permanent support. (3)Fast and easy installation with hand held or mechanized bolting equipment. (4)No cement grout and resin cartridge needed. (5)Available with both black and galvanized. 2.Recommended hole diameter calculation: (1)In The Rock Stratum : Diameter of Hole: (0.9-0.95) ?Diameter of Bolt Depth of Hole: Length of Bolt +100mm Deflection Rate of Drilling : <1% (2)In The Coal Stratum: Diameter of Hole: (0.9-1.00) ?Diameter of Bolt Depth of Hole: Length of Bolt +200mm Deflection Rate of Drilling : <1.5%