For sale a new pair of Shimano down tube shifter cable bosses. These bosses are made for the older bikes that have the down tube shifters. The bosses will bolt onto the shifter braze on and allow you to convert to the new STI shifters. The bosses allow you to fine tune the cable adjustment for your shifters. These down tube bosses will work with any STI type of shifters、 Dura Ace、 Ultergra、 105、 Tiagra、 R500、 Sram、 ect. Approx weight  23g