These 20 deep hexagonal sockets cover the range 4 to 24mm. There are ten 1/4" square drive from 4 to 12mm for torques below 25Nm. The ten 1/2" square drive sockets for torques above 25Nm range from 13 to 24mm. All the sockets are matt chromed and clearly marked with the respective size. Supplied in a tough case.