It appears to me to be a "roller bolt". Somewhere you have a nut and roller bearing without its bolt, could still be in the slide or on the ground. This is what it looks like when the bearing and nut are on the bolt. ~CA
The other possibility is if you are in a campsite, it could have fallen out from the previous RV. I suggest to carefully inspect your slide and the other roller bolts, they are hard to see in many cases but are part of the slide mechanism and can be a challenge to tighten or replace.
To add, this is what a roller and bolt looks like, not necessarily the exact roller you have and need to re-install but in concept the same.
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2010 GreyHawk 31SS
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