The adjuster for a blade on a scythe.
Ok ime gonna sound super stupid here but.........
So me being only 16 I have no idea what a scythe is. Whats a Scythe.
Sounds like a sickle sort of, does it have anything to do with that.
You are not going to sound stupid at all.
A scythe is a two handed mowing/reaping tool. As Dustin21 said, the Grim Reaper is often characterised as carrying one. The item in the attached pictures is a scythe.
A sickle is a one handed reaping tool. There was one, along with a hammer, in the top left hand corner of the old flag of the U.S.S.R. If you need a picture of one (a sickle, not the flag) let me know.