... Steel Tooth Tricone Bit for Oil Well 20years experience in drill bit supply API&ISO9001 certification. API Kingdream Steel Tooth Tricone Bit for Oil Well Steel tooth tricone ... 211, 121, 241, 537….3 7/8 131, 211, 537, 517….4 1/2 211, 121, 241, 537….4 3/4 131, 211, 537, 517 ... , 241, 537….……….. ………………………………12 1/2 211, 121, 241, 537….14 3/4 131, 211, 537, 517….15 1/2 211, 121, 241 ...