Assuming you are looking to purchase this stretcher only for the purposes of the width of your shoe, not the length, you really should always use a shoe stretcher that actually looks like your foot when stretching a shoe.  And with this heel stretcher you just receive the one stretcher, there is no left or right foot.  And I don't know of any human with a foot that looks like this thing!  But nevertheless, they did work for one of my more particularly stubborn peep-toe Marc Jacobs heels.  Since then, I had had no success with any other heel.  Just good old fashioned thick socks folded onto itself so that your sock only covers the front half of your foot and because it's doubled up, it acts as though you have two socks on.  After doing this, jam them into your ill fitting shoes.  I usually hobble around and do chores so that I'm at least a little distracted from the pain.  Depending on the material (only for different forms of leather), it also helps to blow dry the shoes directly on the area that needs the stretching.  Not too much all at once though, gradually heat them so you don't ruin your shoes.  Make sure you have your socks and shoes on when you do this and keep them on and move around in them for at least 10 minutes afterward.  You may have to do this a few times and your feel will definitely ache in the process (for me, a few days), but in the end, you will have a shoe that fits!!  Hope that helps.