Spherical roller bearing steel and copper card card which is called major
but the proportion of copper is larger than that of steel, so the roller bearing copper card major.
The copper card is very important.Here, the copper steel card card, should refer to the holder, and the holder size bearing the same size is the same, but the proportion of copper is larger than that of steel, so the roller bearing copper card major.
The copper card is very important.Here, the copper steel card card, should refer to the holder, and the holder size bearing the same size is the same,
