The Bosch 35 Piece Multi-Construction Bit Set is specially designed for heavy applications these drill bits are suitable for drilling in most materials including masonry brick light building materials multi-layer materials ceramics and your standard wood plastics tiles and metals. The Screwdriver Bits can be used with high voltage Impact Drivers. Centering tips allow precise drilling with good guidance in to the drilled hole. The diamond ground cutting edges enable multi-purpose drilling. Perfect results are guaranteed when drilling with or without impact.