亚洲综合小视频,aaaa一级片,欧美午夜精品久久久久久浪潮,五月天综合社区,精品国产综合区久久久久久,啪啪免费视频网站,美女黄免费看

The product is manufactured through procedures of machining, heat treatment hardening, and fine grinding

Material hardness: more than HRC45

Outer diameter of concentricity: 0.05

Consistency of component weight: within 10g