This is just one of those things that float around in my junk drawers. It doesn't take up much space so it stays in the drawer, hidden in a corner or rolled to the back out of sight. When looking for something tiny it didn't just pop out I had to rummage around a bit until my eyes landed on it. Like the title says it's 4.2mm, spherical and made of alloy steel and to be honest I have no idea where it came from or when it came into my possession. HMM and thanks for any views, faves and comments.
An update. Not a bearing ball. My wife has reminded me that the grandsons had a BB gun phase and they left dozens of these things scattered about some of which ended up getting tossed into various places so as to avoid being stepped on. So, not a bearing, a BB.
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