Sounds like the wear strip. It secures to the black metal trough / ramp that the slide drops into when fully extended. That's what the slide floor rides on when coming in / going out. Sounds like the screws sheared. Definitely needs to be replaced, or resecured pretty quick. Take a look at the underside of your slide floor. Hopefully there wasn't any pieces of screws left in the trough that would scar up the bottom. For now, lift up the carpet flap inside and see if you can see where it was mounted. Might see what's left of some screws. Maybe not an option now, but you can bring your slide in a couple of inches. Then jack up the slide an inch or so to inspect the whole trough a little more thorough. You'll have to evenly distribute the jack pressure with something the length of the slide, and preferably use 2 jacks. Several ways of doing this, so I won't elaborate too much.
John and Rebecca Dickson
Emma-7 / Little John-5 / Iva-1
Full Timing Again, Rev B
2013 Ford F-350 Lariat CC LB PSD
2015 SOB TT - With OC's Awning Poles (#8)
At least in Heaven, RVs will be perfect, and I won't have to keep fixing them.