I ordered one glide for each side knowing that with both it would be even pulling and knowing all the stress it had on the one half good glide that was only a matter of time that it would break just for the fact it was used, broke for a long time. So now it is so smooth and my neighbor's love it because before when it would slide of the rail you can imagine the noise when it hit the floor full of small pots and lids. How such a inexpensive part will keep everything so quiet.