There are 2 different size screen protector for XPS 15 9500.
This is full coverage screen protector for XPS 15 9500 which doesn't have edge bezel
If your laptop has monitor bezel then please do not buy this item
Please note that this is for Fully Flat Screen without edge monitor bezel.

Light Anti-glare Screen Protector for Dell XPS 15 9500 9510 4K TouchScreen

Excellent for Outdoor Readability
Reduces Reflections, Eliminates Glare

Scratch Resistant Coating, Anti Dust, Anti Fingerprint, No Rainbow Phenomenon
Made From The Highest Quality Film
Easy Installation And No Residue When Removed
High Definition Transparency Film That Ensures Maximum Resolution
Real Touch Sensitivity For a Natural Feel That Provides Flawless Touch Screen Accuracy
UV Protection: Reduces Eye Strain Caused By The LCD Screen