The most popular sizes of spade bits and auger bits are included in this convenient set for most wood drilling projects. The spade bits feature a special dual cutting edge for speed and durability when drilling into wood. They also feature wing tip cutting edges for smooth cuts that will not break out the back of wood after drilling through. The auger bits feature four cutting spurs that drill fast clean cuts into wood. Both spade and auger bits include a 1/4 in. hex shank for easy quick change applications when used with a quick change adaptor. Comes in a durable locking case to keep your bits organized.