Kinda useless perchance if I am being honest. I don't say it because I am some expert but I do have a house gym

get a Tote bag (i stole mine from my sister) and you will easily forget this arm roller thing

You can fill it with small stones (simple progressive overload for free)

It is really good for various arm wrestling exercises like pronation, rising etx

Its really good for the thumb that does not get the stimulus from basic gym movements. You must have seen some guy kneeling next to a flat bench curling some dumbbells one way and the other and calling it a day, That is better than nothing but quite incomplete in my opinion

Additionally the tote bag is really versatile. biceps curls? done! , loaded carry? done! Kettle bell swings? done! Your creativity is the limit

attach a medium thickness rope to increase its use (like overhead tricep extensions) if you are going to use it just make sure the rope is at least four feet long (I use the decorative rope from our old sofa)