Weve been receiving calls from both shop & home mechanics looking for a thin wrench to fit the centring flats pivot nuts & lock nuts on many popular brake callipers The new OBW-4 wrench is the answer. It has 10 11 12 & 13 mm openings & is specifically designed to fit the narrow flats found on some of these brakes that can make using standard wrenches difficult This tool is particularly useful when working on dual pivot & side pull brake callipers seen on both current & older models from Campagnolo Shimano SRAM & Tektro amongst others Made from heat treated nickel plated steel for long life & with a hole for hanging on your tool board Made in the USA & covered by Park Tools legendary limited lifetime warranty