I ordered two sets of linear rails from Vevor. There was a defective part and it seemed like a waste to return the whole heavy package for just a small part. I contacted Vevor directly from their website to discuss getting a replacement part. Their associate apologized for the inconvenience and immediately set up to get a replacement part sent to me. While getting a defective part is no fun, they stood behind their product without question. Five star service. Thank you.