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You'll find these screws on the bottom portion of each track. They're used to secure the 2 halves of the track, the top of which doubles as a catch tab to hold the drawer in place. If the drawer you're attempting to remove has metal tracks but no screws at the end, they may be metal glide drawers with levers. See if you can find a pair of track levers to press that will then let you pull the drawer free. Turn the screws to the left (counterclockwise) to loosen them, then pull them free from the holes in the track hardware. Set both screws aside somewhere you won't lose them. Most drawers with stabilizer screws use 2in (5.1cm) #8 cabinet screws, which need to be removed with a Phillips screwdriver. Pull up on both tabs simultaneously. As you do, the top half of the track will come away from the bottom half, permitting the drawer to open past the stopping mechanism. There should be enough of a lip on the catch tabs for you to easily grip them between your thumb and forefinger. Without letting go of the catch tabs, guide the drawer off of its tracks. Hold it as straight as possible and move it in alignment with the tracks to prevent it from sticking. Once it's clear, set it down carefully and move onto the next drawer. If you're going to be removing multiple drawers, check the lip on the righthand side interior of each drawer for a small number decal. These indicate which drawer goes where, which will make it much easier to return them all to their proper place. To reinstall a drawer with stabilizer screws, simply work in reverse: align the door with the track, lower the catch tab over the track's bottom half, then thread and tighten the screws.
Slide the drawer out and locate the stabilizer screws at the end of the tracks. Use an appropriate screwdriver to remove the stabilizer screws. Lift up on the catch tabs to separate the 2 halves of the track. Pull the drawer out the rest of the way.