ManytoManyField (through) not showing up !

I am trying to do a ManytoManyField through a middle Table. After I run syncdb, I do not see the column in pdadmin.
What am I doing wrong?



Here is my code

class Countries(models.Model):

    country_name = models.CharField(max_length=200)
    country_id = models.CharField(primary_key=True, max_length=2)
    region = models.CharField(max_length=200)

    #Economic profile
    gdp = models.DecimalField(max_digits=17, decimal_places=2, default=0.00)
    gdp_growth = models.DecimalField(max_digits=5, decimal_places=2, default=0.00)

class Products(models.Model):

    product_id = models.AutoField(primary_key=True)
    hs_number = models.ManyToManyField(Countries, through='Imports')
    product_descript = models.CharField(max_length=250)

    class Meta:
        db_table = "Products"

    def __unicode__(self):
        return self.hs_number


class Imports(models.Model):
    hs_number = models.ForeignKey(Products)
    country_id = models.ForeignKey(Countries)
    imported_value2008 = models.DecimalField(max_digits=12, decimal_places=2, default=0.00)

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