免费高清毛片无遮挡_精品国产哟哟av网站_日韓福利一區_日韩在线精品一区二区三区激情综合_国产精品原创巨作av网站_五月婷婷开心中文_亚洲日本综合久久_天堂√在线中文资源网_国产中文字幕欧美_亚洲天堂av影视

FDAC nitrogen handle internal hardness :34-36HRC Surface Hardness: HV900 above; vacuum :50-54HRC (overall); such products, the hole formed by the deep-hole drilling process can ensure high accuracy and interchangeability with the . High hardness, toughness, good; use is not easy deformation, can significantly increase the die service life, excellent results.