The locking threaded hitch pin comes and 8’ security cable allows you to lock the rack to vehicle, and the cable allows you to locks bikes to rack and/or vehicle. 206 - 308 Keys (Side Mount / Round Locking Head): Locking threaded hitch pin-bolt is: 1/2"-13 TPI Length with the locking cylinder installed: 3.5" (90mm) Length without the locking cylinder installed: 4.5" (115mm) 8’ security cable Keyed alike - 2 keys included 105 - 107 Keys (In-Line / Rectangular Locking Head): Locking threaded hitch pin-bolt is: 1/2"-13 TPI Length with the locking cylinder installed: 3.5" (90mm) Length without the locking cylinder installed: 4-5/8" (117mm) 8’ security cable Keyed alike - 2 keys included Fits the following current model racks: Sport Rider 2 Sport Rider Recumbent Trail Rider Commuter Traveler RV Rider