Buyers Products Pintle/Combination Hitch Mounting kit is is used to attach lunette rings to heavy duty adjustable channels. It works with Heavy Duty 3 and 5 Position Channels (B9909, B9912), as well as replacement hardware for the Heavy Duty Adjustable Eye Assembly (B20143, B20145). It includes: (2) 5/8-11 x 5 in. Grade 8 cap screws, and (2) 5/8-11 nylock nuts.