Purchase Qty. Reference FOB Price
1-4 Pieces US$260.00
5-9 Pieces US$220.00
10+ Pieces US$170.00
Product Description
Features of diamond concave no core drill bits 1. Big hole design, chip space is big, high drilling efficiency in soft rock. 2. Cutting free surface, sharp blade, with self-sharpening feature, high drilling efficiency. 3. High resistance to wear. 4. According to stratum characteristics, ...