硬质钨钢合金球51.485/51.49/51.495/51.5/51.505mm扩孔挤孔钢球

-5mmj-51535-52535..-钻头-52-51.505锥.54.-54哈尔滨50柄--5.

硬质钨钢球合金球51.49/51.495/51.5/51.505/51.51/51.515mm钢珠