Snapper Pin for Sport Rider 2's and SE (both Y & Z- spec) racks + RV Rider racks and TRS & TRS SE racks. Used on Sport Rider SE (Y & Z-spec) racks and both of the TRS racks as the landing pin, and when removed allows you to tilt the rack down. On the Sport Rider 2 (Y & Z-spec) racks it a llows the rack to fold up when bikes are not installed. 1/2" Diameter 2-1/8" Inside length 3-1/4" Length