With 1/2 Socket Adapter: The impact driver nut driver is equipped with an extension rod that can be used with many types of power drills. Package includes: 10 x 1/2" impact sockets: 10, 12, 13, 14, 15, 16, 17, 19, 22, 24 mm Premium CR-V Steel: All 1/2 socket wrenches are made of cold-cast chrome vanadium steel and heat-treated for excellent strength. The corrosion-resistant black galvanized coating ensures a long service life under heavy use. High Torque: The special 6-point flank drive design turns the flat sides of the connecting elements and provides maximum torque while not rubbing or damaging the corners. Laser Marking: You can easily see the size needed for your job. Each box has a special slot to prevent it from falling. This design can greatly reduce your working time and improve work efficiency.