Our hengji mill tooth/steel tooth tricone bit types are available in sizes ranging from 3 7/8″ to 32″. The wear-resistant material is applied to weld the tooth surface of the  bit, which can maintain the high penetration rate of the steel tooth tricone  bit and improve the life of the cutting tooth of the bit. From soft to hard, many formations are available and upon request can be jetted, skirted or center holed to your specifications.