... industrial and civil construction, geological exploration, large diameter boring pile and small diameter diamond core deep hole drilling, etc. Brief introduction ... ModelHGY-300 Drilling MachineDrilling depth( m)300Drilling rod diameter.(mm)Φ50 Head angle range0~360Movable cylinder stroke ... 531 868 1094Reverse rotation rate: 38 173Spindle hole diameter( mm)Φ65Spindle output torque max(N.M)3100Spindle ...