... increases gauge holding capability and bearing life. 3.Bearing StructureHigh precision bearing with two thrust faces. Balls ... 712,737,837,832Size:3 7/8, 3 5/8,4 1/2,4 5/8,5 1/2,6 ,6 1/2,6 3/4,7 7/8,8 1/2,8 3/4,9 1/2,9 5/8,9 7/8,10 5/8,12 1/4,13 3/4,14 3/4,14 5/8,16,17 1/2,20,22,23 , ... 24,265.Basic Information Product/Service (We Sell):Tricone rock bit,TCI Tricone bit,steel ...