The hardest but most brittle of the solid bits, always use a drill clamp or guide.

• Drill out sheared shafts.

• Drill a shaft to use a T-piece.

• Drill out a damaged thread.

• Cheap ones will bend or fracture.

• Consider using a Drill Guide or Magnetic Drill Clamp.

• Always wear eye protection.

• Always wear hearing protection.

• Consider impact protecting gloves.