Thanks to everyone for all the comments. This definitely looks like the hand crank for gear driven slide outs. All of my slide outs are HWH hydraulic. (Joel, I'm surprised that your bed is on an electric slide mechanism, I thought our coaches were just alike. 2006 Monterey Ventura IV's. It seems that even the same model year coaches were not all built the same.) I see no reason to carry this any longer, so I will relegate it to the garage pile of miscellaneous stuff.
Richard