成人午夜做爰高潮片免费吸气女生高潮多爽|美女高潮迭起|免费日本av在线观看|日本人妻有码在线|孕妇肚形状看男女准确吗|日本熟妇人妻hd|使劲快高潮了对白av|在线视频人妻中文字幕|日本av在线看片|欧美高潮爽到抽搐在线,欧美日一区二区在线观看,www美女黄片av,熟妇老太晚色

ZRQ216-DHD380 drill bit technical parameters

Model

Edge teeth

Middle tooth

Head structure

Number of exhaust holes

Number of splines

Weight kg

With impactor

ZRQ216-DHD380

10-Φ18Q

6-Φ16Q

Concave surface

2

10

50.4

ZRC8A

ZRC8

DHD380

COP84

8-Φ18Q

ZRQ216-DHD380 drill bit features

ZRQ216-DHD380 drill bit is a universal drill bit developed by our company according to the characteristics of domestic rock formations, and its side teeth are adopted

10 18mm alloys ensure the wear resistance and fracture resistance of the alloy. At the same time, the large head adopts a concave layout.

Effectively ensures the straightness of the drill bit during the drilling process, and the drill body adopts a special heat treatment process, which effectively reduces its

The probability of damage such as fracture and block collapse effectively matches the life of the bit body and the alloy, reflecting the high lifespan

And the characteristics of high efficiency.