$54.99 Bosch 1/4 in. Multi-Purpose Tungsten Carbide Drill Bit for Drilling Tile, Masonry, Wood, Metal 
2.5 inch Diamond Core Drill Bit Power Tool Concrete Drilling Hole 1-1/4 7anbor 810684021587 | eBay
1-1/4â Laser Welded Dry Diamond Concrete Core Drill Bit | eBay
