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Kensington N17 Dell Cable Lock for Laptops with Wedge Lock Slot (K64442WW) ... Kensington Security Slot Adapter Kit for Ultrabook K64995WW.

The lock attaches to most major lock slot designs like Kensington® Nano, Kensington K-Slot, even the oversized Noble wedge-shaped lock slots, ensuring those laptops, docking stations, or monitors stay right where they need to be.

It's called a Kensington lock, or Kensington security slot, and it provides an attachment point for a cable to prevent your monitor from being moved or stolen.