Saris' Locking Hitch Tite adds both stability and security to your hitch rack. It tightens up the interface between your rack and hitch to combat swaying and it locks your rack to your vehicle. It fits 1-1/4 and 2-inch threaded hitch-tites and is compatible with the 200/500 Series T-Rax, all Thelma racks, standard-model Cycle-Ons, and all the T-Bones racks (each sold separately).