... Wooden CaseWe can supply rock bits,kingdream bit,smith bit,tricone bits, diamond bits,PDC bits,TCI tricone bits, steel tooth bits ... as follows:1. Andesite, marble, metamorphic schist (For hard, low abrasive formations)2. Gneiss, Diorite, Basalt (For hard and abrasive ... 127,437,517,617,637 TypeTricone bits, Steel tooth bits, PDC bits Applicable water well, oil field, construction, geothermal, ...