* Chrome Vanadium Steel that Has Been Heat Treated for Strength. * Coated with the Professional Chrome Finish that Will not Crack or Chip. * This Set Goes from 7/16" to 1 * 1/4". * Socket sizes: 10, 11, 12, 13, 14, 17, 19, 20, 21, 22, 23, 24, 27mm. * Both