By attaching to the outside of the socket they also allow the socket to be built up to 50% shorter and with 20% less width which is an advantage in some situations. Pass-through sockets and ratchets are built for 14-inch, 38-inch and 12-inch sets in both SAE and metric sizes. By using a fine tooth ratchet and socket system that allow a pass-through ratchet to be used as a conventional ratchet handle with interchangeable 14-inch and 38-inch drives some ratchets can be used with standard sockets. Come with aluminum socket rail for easy storage and transport.