... characteristics of the bit Recommended parametersCutting structureNormal WOB KN/mm(bit dia.)Rotary Speed(rpm)TFJ737G737High abrasive formations such as limestone, ... characteristics of the bit Recommended parametersCutting structureNormal WOB KN/mm(bit dia.)Rotary Speed(rpm)THJ527G527Soft with low compressive strength and ... 88.9MM,98.4MM,114.3MM,117.5MM,120.6MM,130.2MM,142.9MM,149.2MM,152.4MM,155.6MM, ...