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It seems like the doorknobs are usually cylindrical shape in general.
They are not only smooth but also made of metal. It is a problem that the cylindrical lock is hard to turn for the elders without proper friction.
Strong Grip is the product which can make turning the doorknob easier.
It is convenient and lightweight, and it is easy to tear and paste!
Strong Grip is a small non-slip adhesive pad, mainly for the doorknob lock,
so that the elderly have a resistance can hold the doorknob lock, and easy to open the door.
Shih Chien University