... are bellows 1, tricone bit include the steel tooth and tung , we can also produce the HA series ,HJ series ,FA series ... to twelve, the size is 8-1/2”, 9-1/2”, 12-1/4”, 6”, 17-1/2”,4, the Rotary speed is ... used the featured about TCI&steel tooth tricone drill bits:1. High-strength, high flexibility, high temperature and high wear ... life. Sizes and types: Size: Common sizes, 6.6-1/2, 7-7/8, 9-7/8, 10-5/8 ...