$67.99 ALSKAR DIAMOND ADCSB 4-1/2 inch Wet Concrete Diamond Core Drill Bit for Concrete Stone Granite 
Drilax 3-1/2 inch Diamond Hole Saw Drill Bit Heavy Duty Brick Concrete Masonry | eBay
Diamond Drill Bit Core Boring Diameter 1-1/2 Inch Concrete Drill 11 Long | eBay
