Take a look at an instruction video before applying it, the process is relatively straightforward and short. It comes with 2 glass pieces.

Very good quality and design tempered glass. Its installation is very easy and there is no way it won't be placed perfectly straight and centered. There is also a company video on YouTube. I use it on the OnePlus 15 Sand Storm color, along with the case from the same company in Fusion X Camo color and they fit like butter, so smoothly. The package includes 2 Tempered Glass. It also has usage/installation instructions. It is always good after installing tempered glass to have the little tool that pushes the glue and bubbles if you notice any, so you can install it completely cleanly. One of the best purchases I have made, both this and the case from the same company.

Very high-quality tempered glass, fits exactly on the OnePlus 15 and is installed very easily with the installation case included in the box.

Poor quality and difficult to apply. It also said it was suitable for OnePlus 15, but it did not fit properly

Amazing screen protector both in durability and appearance. It was installed very easily on my One Plus 15 and has withstood several scratches and drops without any marks!!
Bonus that it comes with a second screen protector for backup along with the auxiliary items for its installation.

Perfect fit, no problem with bubbles from the very first moment of installation on One Plus 15.
You follow the instructions without rushing and the result is extremely invisible!
It also includes a second glass as a spare.

Very good glass and it leaves no gaps at all. After Spiegen, which doesn't make one for the OP 15, this is the best. When you apply it, re-register your fingerprint because it might not read it