16" top mounted drawer runners (SG17 (Shefford))

I have a pair of 16" (c 40cm) top mounted drawer runners.

These came from underneath a pine bed and were screwed into the slats to hold a drawer, could also work for something like a keyboard shelf. As far as I can see they are straight and all the ball bearings are in place - I've also got the screws used to fit them.

Can anyone find a use for these?

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