Being relatively young and arthritis-free (at least for now), I don't usually have any problems twisting off jar lids. But, once in a blue moon, I get that one jar that almost requires explosives to pop the top off it. And I hate opening one of these with just my bare hands. Fortunately, I found this little device, which has a good sure-grip handle, which acts as a fulcrum to apply the necessary leverage and loosening force, but with significantly less effort than I would if I did the job bare-handed. Just secure the gripper onto the cap, give it a firm, but not-too-hard turn, and another almost-impossible-to-open jar is rendered easily accessible! The opener's metal gripper teeth do dig into the lids a bit, but never to the point of turning them into injury hazards (danger of cutting yourself on the grooves the teeth leave on the lid) in the cases I've used it.All in all, this labor-saving device is a simple, yet very helpful and highly valuable kitchen helper!`Late