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Measure under your desk front to back. Is it a flat surface or are there legs or brackets in the way? Measure the opening of our desk where the keyboard and mouse will be pulled in and out. 21", 24",27" or more. Measure the depth of the desk. You will need a surface under the desk that is 18 to 21 inches to screw the track for your adjustable keyboard arm. A longer track will permit you to retract the keyboard further back under your desk.