This special bolt set is for mounting racks, like the Nitto M12 or Campee, on cantilever brakes. The advantage of these bolts is that, at least in theory, they should not loosen as regular bolts can. And they look very cool, which is paramount. The price is per pair. NCRB$12.50 All images and text copyright Velo Orange, LLC 2006, 2007, 2008.