I like my old chair but the mechanism below the seat had finally broken. I spent a lot of time researching new chairs (expensive) and looked for a long time to just replace everything below the seat. I eventually bought this product and installed it to the bottom of my chair. It is important to measure the hole spacing and order the right replacement part which I did. This product fit perfectly and I am using it right now as I type this review. Much less expensive than buying a new chair and I am back in business with a fully functioning chair.