Today's tool is not for everyone, but if you sew corsets you will be happy to own it: Pliers to insert eyelets!
What is it good for?
It punches little holes into the fabric and helps to insert eyelets without hammering them in. Which is both good in case you like to keep a calm neighborhood and to make the eyelets prettier. I know what I'm talking about, because I cheaped out for the first 5 years (or so) of corset production and boy, is this thing helpful! No more damaged wood from hammering, inserting eyelets during the night (no judging, late night sewing right before an event is totally a thing!) and my hands hurt less - win-win-win situation!
How much does it cost?
It is not that cheap - at least when you get the expensive one from Prym for 15 Euro. But hear me out - the cheap ones really don't work so well! I tried and spent 5 Euros for the cheap one and then bought the expensive model, so safe yourself my mistake and some money! I also buy the expensive eyelets because they just work so much better, but I buy 500 of them (for 40 Euros) instead of the small packages (10 eyelets for 3 Euros). If you know a better deal - or cheap eyelets that work well - go ahead and write a comment!
Who needs it?
People who use eyelets or no-sew snap buttons or generally like to punch little holes into fabric. As I said, you absolutely NEED this for corsets, otherwise it is just nice to have. I consider buying a second because changing the fiddly bits for punching holes and inserting eyelets annoy me. You probably don't need two, though! ;)