Hello, I'm glad to see  the message you released on the internet. I?m David of LiTong Hardware .We are the professional manufactory of  ball bearing slide . We supply slides  of  17,27,35,36,45,53,57,71 series?and package series ,concealed series, filling  door slide. Our main customers are HAFELE and TOPSLIDE. If you need You can contact me. I will be pleasure . Thank you