This month's mystery items are bearing scrapers, used to remove burrs and ease high spots on machine components. Because they're used on different types of machinery in a variety of industries, not all of them are shaped the same. To enlarge pic, click here. 

This "Beginner's Workshop" fact sheet explains how bearing scrapers are used and why. Click here to enlarge.

This page out of Alvin Sellens' Dictionary of American Hand Tools: A Pictorial Synopsis shows a variety of bearing scrapers, the first two of which are similar to ours.

Click here to enlarge image.