当前位置：Widetop > W1 > Widetop > Nigh-speed steel, used for making twist drill bits Nigh-speed steel, used for making twist drill bits 作者：WIDETOP • 2019-06-28 The high quality steel used in drills for most maintenance and industrial applications. 上一篇文章 : Flute length of the twist drill bits 下一篇文章 : Land and Land width of the twist drill bits