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2. Bottom-Mounted Rollers These rollers are installed at the bottom of the window frame. They are designed to bear the weight of the window and help it slide along the track. Bottom-mounted rollers are more common as they offer better stability and are easier to maintain.

Sliding door rollers are typically located at the bottom of the door panel. These rollers allow the door to glide along the track, making it easy to open and close. Over time, dust and debris can accumulate in the track, or the rollers themselves may become worn, resulting in a door that sticks or will not slide properly.