Some context would help. What does your company make or do? What other parts are around it? It could be a tool for installing/removing sleeve bearings or seals.
Just label it big round steel thing, if its been lying upstairs and nobody has a clue what it is - what is a name?
It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)
Don't label it "steel" unless you're sure that's what it's made of!
Why not take it to whatever part of the shop people go to to eat their lunch/complain together over a cup of coffee and offer two small prizes (these needn't be anything larger than a Mars bar):
One for the first person to identify the item correctly.
Another, slightly larger, for the most amusing alternative suggestion (without this prize on offer, amusing alternatives may well be all you get)
5S it. That's what they do around here every time there is a change in management. They see a store room full of "junk" and tell maintenance to clean it out. Bring in a dumpster and start heaving it in. Doesn't matter if they are throwing out boxes of Swagelok fittings, microscopes, etc., it all must go. Don't bother to ask the people who stored the stuff, don't bother to hire an intern to inventory the stuff and figure out what it's worth. Just dump it. One ex-employee contacted the dumpster company and arranged to have it delivered to hie place of business. He went dumpster diving and recovered over $12,000 worth of very usable hardware. Would have been more but the microscope didn't survive the toss.
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The Help for this program was created in Windows Help format, which depends on a feature that isn't included in this version of Windows.
If you have no part number, no certification, no instructions, don't know what machine it fits or why it's even a spare part, then this is simply some scrap metal.
I agree about the end of the roll thing, but do these wear out? Shouldn't you have two - one for either end?
Looks to be incredibly heavy for that duty - perhaps just label it as a door stop?
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
Valve lapping spacer - or some comparable maintenance or outage repair period. The outer diameter (with its larger stop diameter) is placed in the valve bonnet position, then the valve lapping tool goes through the small hole so it is concentric with the valve seat (down below) and concentric with the valve bonnet. Then the lapping tool is rotated for a while as the valve seat is re-contoured. This disc is not the lapping surface itself. Rather, it is a tool to support the lapping tool when the bonnet is removed.
