The KnKut 12-pc Quick Release Drill Bit Set places the most popular drill sizes all in one storage case. The hex shank holds the drill securely in place and the 135-degree split point starts without the use of a center punch making starting holes simple and easy. Along with a quick release adapter, this 12pc set includes the following bit sizes: 1/16",3/32",1/8",5/32",3/16",7/32",1/4",5/16,3/8",7/16"and 1/2". Made of special hi-molydenum tool steel, this set comes in a molded plastic storage case.