[https://www.amazon.com/dp/B00DWW4JYQ?tag=dmflip-20&linkCode=ogi&th=1&psc=1]
Lackmond SPL Series – Wet Cured Concrete Core Drill Bit – 3-1/2″ Reinforced Concrete Hole Saw with Segmented Diamond Rim Configuration & 1 1/4″-7 Thread Arbor – 500312
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