... design is most effective in formations with compressive strengths under 5,000, such as shale, clay, red bed, medium limestone ... the teeth. The most effective weight range varies from 1,000 to 5,000 pounds per inch of bit diameter, while ... teeth 2) X-chisel teeth3)K- wide teeth4)G- Gague protectionMaterialAlloy steel ,carbideMarketCanada, USA,Middle east ,Africa,Europe API New Kingdream 8 1/2" Steel ...