12" Core Drill Bit 1 1/4" x7 arbor thread. Use on core drill machines that have an RPM of under 400 for best results. Wet use only. Weght is 41 lbs. Laser welded teeth segments for perfect balance. We core drill about 700 12" holes into concrete walls and floors ourselves annually. The core drill bits pictured on our online core drill bit store are the same ones we use.
This is one of our actual 12" core drill bits drilling a wall in Stanley, North Carolina. Notice how we have it anchored down to the concrete wall for support. DOES it look like the same picture we have for our 10" core drill bit? It's not. you can find out why at our youtube page Charlotte core drill you tube page