Department of the promotion of coal drill three small products, and ??27mm, ??28mm, ??30mm, ??32mm four specifications.

Detailed parameters

In three small products based on user requirements can be customized according to ??36mm, ??3 8mm, ??40mm, ??42mm type bolt drill bit, to cater for the various ??26mm-??40mm drill rods and bolts of the machine B 19, B22 hollow hexagonal drill pipe the use of holes. Is divided into two categories, I type for soft rock drilling, II-type applies to hard rock and hard rock drilling.