... ISO9001&API 2))used for water well, oil field 3)multiple gauge protection steel tooth tricone bit,steel tooth bit Fast drilling speed ... working life Quantity of reliable rock bit in stockSteel Tooth bits(Milled tooth bit),Tricone bit, rock bit,steel tooth tricone bit1.Sizes ... O-ring sealed bearing or roller non-sealed bearing.4.Used for mining, hydrology, subterranean heat,piling, water well drilling ...