... for Oil Well 20years experience in drill bit supply API&ISO9001 certification. API Kingdream Steel Tooth Tricone Bit for Oil Well Steel ... and new techniques and new techniques. 2. Gauge StructureGauge protection with gauge inserts on the gauge surface of the cone, tungsten carbide inserts ... 2 211, 121, 241, 537….………..………………………………26 131, 211, 537, 517…. API Kingdream Steel Tooth Tricone Bit for Oil Well