... are waiting for cooperating with you and your company sincerely.HJ series bit for oil well drillingMain structure features: 1. High ... to 250°C is utilized. Available sizes and types of HJ series tricone bits:HJ117, HJ127, HJ137, HJ417, HJ437, HJ447G, HJ517G ... /month Delievery Time within 7 days after conform order API 12 1/2" kingdream Newest TCI tricone bit