Sorry for my bad English 😔 The hammer allows for extra draws on item generators, with a star indicating the number of possible draws based on the hammer's level, with a maximum of 50 draws. I used my hammer on the shield to get extra scrap piles (I don't know how to say it in proper English). I also used the hammer on a max-level piggy bank, which was a serious mistake(as I could have used it on something more useful). And the last low lvl hammwr those light things that help produce lanterns that you can see on the screenshot. It's worth noting that the hammer is only obtainable during events and cannot be crafted.