Hartz Salt & Mineral Wheels For Small Animals

It doesn't make sense that they only include one hook sure I can make one but I would expect more from this well known pet supply company.

I bought this a week ago for my Syrian hamster and at first i had pictured that it would hook on to the side of the cage and be able to rotate as he chewed on it BUT it wont stay upright on the cage bars of my Habitrail Retreat + Ovo cage set up.instead I hang it from the cage bars above. He doesn't really use either block but when he does he usually drinks a good amount of water after. they trim down teeth only a little but it is good for entertaining.