Serfas The Puck Folding Lock Revolutionary steel-plated lock design that folds up to a compact self-contained unit and stores securely on your bike. A name reflective of its compact form factor, the Serfas?« Puck Lock looks a little like a hockey puck. Stainless steel rivets form hinges on each of the Puck?ÇÖs curved 5.5mm thick hardened steel articulating plates. Unfolded the lock opens to a useful 2 ft (61 cm) length that can be used to secure your bike. Frame mount with quick release included.