Ring of sustain ability
Wearing a ring of sustain ability gives you the sustain ability property, which means that your base attributes cannot go up or down. It is not a good idea to wear this ring for long periods, because it prevents your attributes from being increased through exercise, but if you lack poison resistance, it is useful to wear a ring of sustain ability while eating poisonous corpses to avoid the Strength loss.
Identification
A ring of sustain ability can be identified by dropping it down a sink(losing the ring in the process), or by wearing it and doing something which ought to change your attributes like eating a poisonous corpse without poison resistance, eating a tin of spinach, quaffing a potion of gain ability, or #sitting on a coaligned altar. Alternatively, zap a wand of enlightenment and look for the line "You have fixed abilities".
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