What is this tool?

[Toolmaker51]

I limit my singing to the shower; as non-operatic possible.
I did my bit with one testis set free in 1998.
No political perspirations, inspirations, or aspirations. Though, distributing a sprinkle of asphyxiations IS in order.
And, I limit trepanning to the engine lathe for O-ring grooves and flat gaskets.
Gave up proctoring when I finished in the Navy. Nobody taking exams, no need to monitor!
So I'm good, whatever the 840nm lens is. I'm inferial!