The Advantage 2 Bike Folding Prong cycle rack is suitable for bikes of most types. The arms can be easily removed and folded away for easy storage. The fixed straight bottom socket includes 2 metal loops for securing bikes and can also be used to lock bikes to the rack with the use of a cable style lock. EziGrip 150mm (Pt# 7180) 250mm (Pt# 7185) extensions can be used where further clearance is required. Fits on both 1-7/8 #8221 and 50mm style tow balls. Complete Rack Includes: #8226 Bungy Kit #8226 Allen Key Not suitable for Euro style tow bars. Warning: All 4 Bike EziGrip #8482 bike racks and all 150mm 250mm bottom sockets should only be used on tow bars manufactured with 20mm thick tongue material and with the use of an EziGrip approved satety strap.