The advanges of tapered drill rods:

1. Higher quality

2. Strict quality control

3. More reasonable price

4. Better after-sales service

5. Professional suggestion
 

The tapered drill rods have these advantages: it reduces the expense of impact energy, improves the drilling speed and efficiency, there is no limit for the drilling direction and the low-limit of diameter.
All the advantages make this type rock drilling tools not only apply to the excavate project, but also the outdoor-drilling downwards.