What is the difference between a Kensington and Dell security cable?

Kensington Portable Combination Laptop Lock · It works for the laptops with standard security slot which size is 7×3mm · Features · Tested, Re-tested and Tested

The Kensington Security Slot is part of an anti-theft system designed in the mid 1980s and patented by Kryptonite in 1999–2000, assigned to Schlage in 2002,

kensington lock slot use The ClickSafe® Universal Keyed Laptop Lock fits any laptop security slot — standard T-bar

kensington nano security slot™ The Kensington security slot is the Specific to DELL computers, the Wedge security slot is smaller than the Kensington