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Interlocking Kelly Bar Number Outer Diameter(mm) Elements Max Drilling Depth(m) Retracted Length(m) 1 254 2 or 3 10 to 30 6.45 to 11.45 2 292 2 or 3 15 to 42 9.35 to 18.20 3 298 3 15 to 33 7.35 to 13...