These delrin inserts come as a pair and are exclusively machined by Cub Crafters to fit the Bogert Tow Bars. Originally designed by technicians on our assembly line to protect the tail wheel from scratches while moving aircraft around in final assembly. Inserts fit both the 3200A (04M-TDG) tow bar and the 3200B (04M-ABI) tow bar. The inserts minimize play between the tow bar and the tail wheel while also protecting the tail wheel from being scratched or marred by the Tow Bar. Simply apply a small amount of epoxy such as JB Weld to each insert to hold them in place.