Don't ask me how I know ... but I think its for making hook / knot rugs !
That's exactly what it is for. A real lifesaver for me, as I have trouble fitting my hand inside of the can trims that use the springs.
My father in law used to work for Point of Sale, and he found his old tool kit and gave it to me and this was in it.99cents said:It's a mechanics tool but it might work on pot light trims. Where did you find it? I went to Crappy Tire and KMS but they don't show anything like it.