... soft shale,clay and salt bed,etcHardfaced gage and all tooth surfaces.0.25~0.70200~80TGA125125Soft with low,compressive stringth ... gypsolyte,soft limestone and sandstone,etc.Hardfaced gage and all tooth surfaces.0.25~0.70200~80TGA214 TGA215214 215Medium hard with ... gypsolyte,soft limestone,sandstone and dolomite with stringers,etc.Large radius offset crested scoop compacts in inner row,wedge compacts in ...