Keystone Drill Services LLC (KDS) specializes in the repair of down hole hammer drill bits from all manufacturers, in all models and sizes.  bit repair services include insert replacement using carbide inserts or diamond inserts.  Insert sizes range from 5/8- to 1-inch in diameter.  Bits with carbide inserts can also be sharpened using robotic arm grinders.  KDS has repaired bits from all manufacturers with sizes ranging from 6 to 36 inches.  KDS calls itself a one-stop shop for all hammer, bit and compressed air drilling needs.