Serrated Pagoda Drill Bits Multi-layer Bits 20mm/35mm/50mm/Three Sizes Hole Enlargement Brazing Diamond Bits

1. High brazing process and Serrated drill bit, efficient construction sharp dry cut

2. Three speed reaming and chamfering:20mm/35mm/50mm

3. Brazing multi-layer reamer ,expand hole, chamfering and edge trimming.

4. Dry Pagoda Bits, No need water and no need to change drill bits during work, saving time and improving efficiency.