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Is this a hard drive?
Both sides.

Yep. Old xt-era hard drive.

Resell or scrap . I have 5 or less.

Sorry. Which item in picture is a hard drive ? Both ? I can't find them online.

The big one is a hard drive. The little one.. from the picture I'm thinking ia a floppy drive.
Those old xt 8" and early at 5.25 inch drives, like the one you have pictured, have a fairly high resale value in WORKING parts to a small group of people.
If any of it worked before hand and you don't mind waiting weeks, or months, for a buyer I'd sell the parts. The shells go for over $5. Working motors run $10-20. And the boards can go from a few bucks up into the hundreds
Totally dependant on the serial numbers for board pricing.
They're not easy to sell and I've had parts sit for over a year. But I've never gotten less than $30 total for working drive parts per drive. and some old Seagate and ibm drives fetched me over $200 each total.
Once you open it the platters are ruined and selling whole working drives is worse than a trip through hell in making sure a working drive arrives at the buyers address.

So the short answer to your question is...
If it worked when /you/ got it sell the board on ebay or Craig's list or the hard drive exchange. Just post the serial number in the title. And wait...!

That case is almost definitely going to be A zink-magnesium alloy. the motor will go class 1 cbm. Board sort will take the platters but xt drives are better off at a jewerly shop or pm buyer due to them being gold alloy and boardsort doesn't have a class for those.
A dead (or unknown) board ranges as either telco or hard drive board. Determined on site by them.