The Thule Tram Hitch Ski Carrier with locks transforms your summer bike rack into a winter ski and snowboard rack for your vehicles FEATURES- One-Key lock system included to lock skis or boards to carrier- Compatibility on Non-Current Thule Bike Racks: Apex, Apex Swing, Range, Vertex, Vertex Swing- Carrying capacity of 6 pairs of skis or 4 snowboards with 2″ class 2 receiver- Ultra soft rubber arms hold skis and boards securely without scratching surfaces- Carrying capacity of 4 pairs of skis or 2 snowboards on 1.25″ hitch racks or Thule spare tire carrier- Over sized push buttons allow for easy opening and included locks keep your skis/boards safe- Requires Thule hanging hitch bike rack for use (not compatible with Thule Helium or Thule Helium Aero)- Compatibility on Current Thule Bike Racks: Apex XT, Apex XT Swing, Camber, SpareMe Pro