This round plastic grommet replacement fits certain LifeFitness treadmills. The grommet works with a screw to fasten something to the frame of the treadmill. An example of where you will find the grommet working is with some of the plastic caps and covers on the treadmill. You will also find the grommet with the bracket to hold the console power supply on some models of treadmills. Another example of where the grommet fits is the motor cover for some models of treadmills.