This piece of glass perfectly fits my iPhone 12 Pro Max, as well as its Otter Box brand case. I love my iPhone in an Otter Box. For some reason, the glass on this particular iPhone is not covered "permanently" by the Otter Box design. So this piece of glass does the trick! It is an extra layer of protection for my expensive iPhone touchscreen. Tip: take your time to wipe dust off of the iPhone touchscreen before you apply this glass with its special "adhesive" action. I got a few tiny speck of dust that can form a small "bubble", visible from different angles of viewing, not visible all the time.
The screen protector was fairly simple to put on and the apparatus used to ensure the screen was on correctly was useful. My only issue was one corner, upper right, did not adhere to the screen. I have attempted several times to get it to stick and have been unsuccessful.