What is this tool used for?

1 looks like a boring tool for a lathe and the other is 1/2 of a depth scale or a scale that catches an edge
 
Looks like a homemade cold chisel. I have a few of those made out of lathe bits and broken taps.
 
If it is a homemade chisel. Be careful and wear at least safety glasses. Because the whole thing looks hard like not annealed HSS (if it could be annealed?). So if struck, it can fracture/break and send stuff flying.
 
It's a hook scale and a chisel . :)
 
it appears to be a piece of HSS that has been (poorly) purpose ground
 
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