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 1⁄4-inch, 3⁄8-inch and 1⁄2-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 1⁄4-inch and 3⁄8-inch drives some ratchets can be used with standard sockets.