Hello, I have been moving this around for a while, and I have been trying to find out what it is, or used for. The raised letters spell SPEEDMATIC, I am guessing maybe a counterweight for an older machine? I live in Syracuse, NY, not far from the original Porter Cable Plant, and every once in a while, some of their stuff that wasn't sold to the public turns up.This piece measures 12" long, 4" high, and 3" deep., looks like a railroad rail.It weighs 33-1/2 pounds. I have asked some of the locals about this piece, with no luck. Thanks, Lou