An independently rotating large cup affixed to the top of a fence prevents the hands of intruders from gripping the top of a fence to climb over it. What is the name for this technology?

Roller barrier  is the name for this technology.

is something that can be used for the prevention of dangerous events and also keeping something in track. It may be vehicle for example. Roller Barrier is an effective anti climb. This consists of fire resistors and also rotating plastic cups which has the ability of self extinguishing and are connected to a shaft at the center.

These will be supported by the brackets placed at a specific intervals that are regular in manner. The plastic cups used here have diameter helps bigger hands also to get a gripping power during hanging. In the situation given, the technology that is used is Roller barrier.

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