Our high quality 400 mm drill bit is perfect for use with electric core drills for drilling on granite, hard stone, concrete, reinforced concrete, and other hard surfaces. Its durable construction will ensure smooth operation of the drills. We also provide bits of other sizes to meet different drilling needs. Segement Height: 7 mm. Threaded connection: 1 1/4. Brand Unbranded EAN Does not apply Model Dry and wet Item Condition New MPN Does Not Apply. Dry and Wet Diamond Core Drill Bit Drilling Tool Accessory Multi Sizes AA. Hope you can understand and cooperate with our work, thank you! Dimond Core Drill Bits Bit Wet Dry Drilling Accessories Professional Tool 400 mm.