选用优质高速钢，多层切削几何，保证稳定的钻孔性能。

Made with high quality high speed steel. Adopting multiple-ply geometry, which guarantee smooth cutting.

youdao

选用优质高速钢，多层切削几何，保证稳定的钻孔性能。

Made with high quality high speed steel. Adopting multiple-ply geometry, which guarantee smooth cutting.

youdao