On my door the holes had plastic plugs in them.
Adjust sliding glass door.
Spray the entire sliding glass door track with a silicone based lubricant to ensure your door glides smoothly.
Inside a standard sliding glass door there are adjustable rollers that help it slide back and forth on the track.
How to adjust sliding glass door rollers for a smoother ride.
How to adjust sliding glass doors.
If it s too low use a flat pry bar to raise the door while you turn the adjusting screw clockwise.
Be sure to wipe up any excess that gets on the floor it can make the floor very slippery adjusting the height.
Regular vacuuming of the track will help keep the door sliding smoothly.
You can alter the height of these rollers by accessing the adjustment screws which are set into slots on the door s outer edges perpendicular with the rollers themselves.
Most sliding glass doors contain two sets of rollers one on each side of the bottom of the door.
They may be covered by plug covers.
On the bottom portion of your sliding glass door you should see a small hole on each side of the door.
These holes hide the adjustment screw for the coordinating rollers.
First locate the screws on the bottom of your sliding glass doors.