220 x 400 mm Dry and Wet Diamond Core Drill Bit. Our high quality 220×400 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. Size: 220 mm X 400 mm. Segment Height: 7 mm. Threaded connection: 1 1/4. Prices are for one item. Even if images show multiple items this is for one and sent at random, images are to show all items you may get. Professional Assembly Requirement: Please ensure that only a professional handles the assembly. Warning: It is illegal to ride electric scooters on public roads, pavements, or cycle paths. They are intended only for use on private land with the owners permission. See Guidance for local areas and rental operators of e-scooters.