Sollroc 4'' 114mm-127mm SRC004 RC Drill Bit For Sampling

4'' 114mm-127mm SRC004 RC Drill Bit For Sampling Specification: Diameter:114mm-127mm ( 4 1/2'' - 5'') Buttons * button diameter: Gauge 8*14mm + Centre 8*13mm / 8*14mm Flushing holes:2 Shroud diameter (mm):122 - 125 weight (kg):11.8 - 12.8 Advantages: 1.A higher percentage of uncontaminated cuttings 2.Drilling rate similar to open hole drilling, but can often be faster and penetrate greater depths 3.One of the most accurate drilling methods