244×400 mm Dry and Wet Diamond Core Drill Bit. Our high quality 244×400 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: 244 mm X 400 mm Segment Height: 7 mm Threaded connection: 1 1/4. Size: 244 mm X 400 mm. Segment Height: 7 mm. Threaded connection: 1 1/4. Sorry, our items are NOT available for pick-up. No additional information at this time. You might also like. PawHut Dog Crate Furniture on Wheels, Dog Cage with 2 Drawers, Sliding Door, for. Rattan Modular 7 Piece Furniture Set – Grey. Rattan Modular 6 Piece Furniture Set – Black. Rattan Modular 6 Piece Furniture Set – Grey.