Snap-in installation: :Simply insert the adjustment lever into the hole at the bottom of the screen so that the bottom of the roller is flush with the screen, and then you can easily slide the roller in. There is an adjustment hole in the side frame of the screen where you can use a screwdriver to adjust the vertical height of the roller for optimal use.Widely Compatible: : For use with upper screen roller part number 1997063. Commonly used to replace bottom screen rollers on Andersen 200 Series Perma-Shield Gliding, 200 Series Narroline Gliding, 400 Series Frenchwood Gliding and 400 Series Frenchwood Hinged Doors.Wheel POM material: Housing lower screen door rollers aluminum + POM composition, 100% POM concave wheel diameter is 1-1/4", thickness is 5/16". The POM material makes the roller glide quieter and smoother, prolonging the use of the roller.Package and Note: Package includes two lower screen door rollers. we recommend replacing both rollers at the same time. It's good idea to clean the track if it's dirty.Replace Old or Break Rollers: : If your sliding screen door start getting stuck or keep jumping off the track, it's time to replace with brand new sliding screen door lower roller, work with andersen gliding patio door insect screens manufactured from 1991 to Present.