Like S-K and other American tool manufacturers, Snap-on was founded in 1920 to make wrenches, primarily for mechanics. The company was particularly well known for its sockets and ratchets—indeed, the firm takes its name from the way in which its sockets were designed snap securely onto their handles. No surprise, then, that its first product was a set featuring five handles and 10 sockets—the company's slogan was "5 do the work of 50"—allowing mechanics to get maximum torque with one handle or to work in a tight space with another, depending on their need. The earliest Snap-on sockets made during the 1920s were identified by the stamped letters "S" and "O," the latter struck over the former, but it wasn't too long before the words "Snap-on" with a lowercase "o" were commonplace. The size of the opening was also struck onto the outside of the socket, as was a date code from 1927 to 1929. During those years, Snap-on tools did not have a lifetime guarantee, so the date code helped retailers decide what to do when customers with defective sockets came into their stores asking for a new one. Sockets were designed to snap onto 1/2-inch, 5/8-inch, 3/4-inch, 7/8-inch, and 1-inch handles, the working end of which is called the drive. The earliest handles had knurled grips and bent at the drive end to provide an offset, so that the teeth inside the socket were at a right angle to the handle, but later handles were straight, with a more traditional-looking offset drive at the end. Snap-on made a number of Tee handles, from a sliding model to several sizes of non-sliding Tee handles, some of which were equipped with rotating grips. Brace handles resembling drills, with or without rotating handles, were also popular types of vintage Snap-on tools. Naturally, Snap-on also made extenders for its handles, as well as universal joints, allowing the mechanic to tighten or loosen nuts and bolts at odd angles. Snap-on ratchets arrived in 1923 with the No. 6 Ratchet. Logos on these vintage Snap-on tools were usually forged, and sometimes the name of the company's home town at the time, Milwaukee, Wisconsin, was also forged on ratchet handles (later models would be marked "Kenosha"). And because so many Snap-on tools were used by auto mechanics, the company made a number of box-end and so called "Hammerhead" wrenches for Buick and Chevrolet. By the end of the 1920s, Snap-on opened a second division called Blue Point, which it used as the brand for its specialized wrenches. During World War II, Snap-on joined countless other American manufacturers by producing goods for the military. But the 1940s were also when the company turned its attention to tools for the growing railroad market. In addition, it was during the late 1940s that Snap-on pioneered the practice of sending a motorized sales force out into the field in a fleet of vans to sell tools to local gas stations, auto mechanics, and other customers. Before long, a red Snap-on tool box was a common sight at many a neighborhood garage.