this brand of water drill is of good quality.

the main material of the pilot water bit is diamond. Diamond is the hardest substance known in nature at present, with high wear resistance and impact resistance, so it is very suitable for drilling hard materials, such as concrete and stone. In addition, diamond has good chemical inertness and is not easy to react with other substances, so the performance of the pilot water drill will not be reduced due to wear during long-term use.