久久夜色精品国产网站,久久久99精品免费观看,亚洲日韩AV无码一区二区三区人,西西人体WWW大胆高清,无码精品人妻一区二区三区漫画,日韩精品无码人妻一区二区三区,国产乱子伦视频一区二区三区,亚洲成AV人综合在线观看,国内精品久久久久国产盗摄,又大又粗又爽又黄的少妇毛片

ZRQ90-DHD3.5 drill bit technical parameters

Model

Edge teeth

Middle tooth

Head structure

Number of exhaust holes

Number of splines

Weight kg

With impactor

ZRQ90-DHD3.5

6-Φ14Q

5-Φ12Z

Plane

2

8

4.3

ZRC3.5-DHD3.5

ZRC3.5A-

DHD3.5

ZRQ90-DHD3.5 drill bit features

ZRQ90-DHD3.5 drill bit is a universal drill bit developed by our company according to the characteristics of domestic rock formations, and its side teeth adopt 6

A 14mm alloy ensures the wear resistance and fracture resistance of the alloy. At the same time, the bit body adopts a special heat treatment process

Technology, effectively reducing the probability of damage such as breakage, chipping, etc., so that the bit body and the alloy life can be effectively matched,

Embodied the characteristics of long life and high efficiency.