Our iconic spoke wrenches have been a mainstay of our product lineup since we introduced them over 40 years ago. With their simple design and professional quality, they&';re still the favorite of bike mechanics around the world. Each Park Tool SW-2 is made in the USA, and is precision-stamped, hardened and nickel plated for long service. Park Tool spoke wrenches are vinyl dipped to indicate the size at a glance. SW-2 FEATURES a Sized for spoke nipples with 3.45 mm (0.136") wrench flats a This size is often found on most department store bikes, as well as many other low-to-midrange bikes - always measure to be sure