Hello. I have come across a strange padlock i was hoping someone with more knowledge then myself could help out me out with. The key hole is round about 3/8" in diameter i would guess, looks to be about 1" deep. In the inside there are 6 slots on either side. I browsed the net looking at pictures of keys and i think the key to the very left in this attached picture would fit it. What are these locks called? Is this a standard key that will open all these style locks?

thanks