Quality drill bits, all impact rated for impact drivers with ¼" impact twister drilling shank. Designed for drilling masonry, wood and metal. Twister HSS cobalt drill bits contain 5% cobalt for increased wear resistance and increased durability. Nail-proof stubby Woodbeaver is ideal for inter-joist drilling. Acceler8% holesaws are designed for drilling sheet steel. Extension rod and SDS Plus adaptor for extra reach and versatility. Supplied in a stylish and durable set case for protection.