Customer Reviews for VEVOR Core Drill Bit, 4\" /101.6 mm Diameter 5/8\"-11 Shank Arbor with a Pilot Bit & 4.5\" Blade, 9.5\" /241.3mm Depth Diamond Dry Coring Bore Tool, Masonry Hole Saw Bits for Hard Concrete Brick and B
I use this bit to drill a 4 inch diameter hole Through a 10 inch thick concrete foundation wall. It worked great. Drilled a hole for dryer vent through the wall. I would recommend.
There is nothing wrong with the size of the core Drill Bit just the threads is 5/8 and the machine is 1 1/4 so it will no fit the machine I was going to return it to you the core drill bit but I have had to buy a part from America to get the Core Drill Bit to fit the Machine cost me about £ 70.00
Ontario Canada 
