【Core Drill Bits】：1 inch core drill bits,14" drilling depth, thread 5/8"-11 Arbor,please check whether the core drill bite size matches the machine before purchasing. 【Special Wavy Segment】：Laser welded diamond coring bits have special wave segments, regular height serrations and concentric shaft designs. High quality diamond guarantees fast speed drilling,long life,smooth drilling. 【Wide Application】：Core drill bits for hard masonry such as concrete, reinforced concrete, block, hard brick, asphalt, marble, etc. 【Wet Drilling method】：Hand held drill, drilling machine.Start drilling in a vertical position and continue digging deeper. A small amount of water can extend life. Use wet only. 【After-Sales Service】：Please feel free to contact us in time if you have any other problems and questions,we hope that you have a pleasant shopping experience. Diamond Core Drill Bit Wet core drilling is the preferred method of drilling for most core bits, Diamond Core Drill Bits Using Laser Welding Using advanced laser technology, the segment will not break in use, Wet core drill bits are widely used and have a long life.It has been exported to many countries around the world. Diamond core bit using laser welding using advanced laser technology, in the use of the process will not break, wet core bit is widely used, long service life. Very popular in the North American market