This is an improved version of the tool used to adjust the eccentric nuts on the backing plate of the drum brake. It is made of stainless steel and both ends are designed to easily access the nuts.  This will work on all 1960s and 1970s BMWs with drum brakes including the NKs, 1600/2002s, Bavarias, 2000CS, and the CS coupes.
NOTE:  This tool, like the original, is not designed to break loose rusted, frozen eccentrics.  You must first use heat, penetrating oil, and even a pipe wrench to break the eccentrics loose before adjusting them with this tool.