2-1/2" Dry Diamond Core Drill Bits for Brick and Block with 1/2" Shank Pilot Bit Adapter, 9.5" Drilling Depth, 5/8"-11 Arbor - Amazon.com
8" Inch Diamond Wet Core Drill Bit 1-1/4” Threaded by BLUEROCK Tools for Concrete Rebar Asphalt Brick Rock Masonry Hole Barrel Coring: Amazon.com: Tools & Home Improvement
2.5" Inch Diamond Wet Core Drill Bit 1-1/4” Threaded by BLUEROCK Tools for Concrete Rebar Asphalt Brick Rock Masonry Hole Barrel Coring 2-1/2" - Amazon.com
HBKEEN Core Drill Bit for Concrete Diamond Laser Welded Core Bits 1-1/4"-7 Threaded for Hard Concrete Brick and Block (4 inch) - Yahoo Shopping
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