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A jar opener for screw-off lids

Prestige Jar Opener for screw-off lids using rubber timing belt

Jar opener for preserving jar with lift-off lid - patented by Havolit, manufactured in 1950s

Automatic jar opener one-touch / Robotwist

A jar opener is a kitchen device which is used to open glass or plastic jars. A jar is sealed by either (a) a screw-off rubberised lid or (b) a lid placed on the opening of the jar with a rubber sealing-ring between. Screw-off lids are usually made of metal with a thin rubber sealing layer, whereas lift-off lids mostly consist of glass.