... diamond bit and impregnate bit.3, the number of blade scope is four 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 ... Size: Common sizes, 6.6-1/2, 7-7/8, 9-7/8, 10-5/8, 12-1/4 Various sizes also can ...