$63.99 Stones Drywall and other Masonry Construction Work Concrete Max-Craft 1/2 Inch 5 Pcs Pack 
How To Drill A 2 Inch Hole In Concrete - Small holes that are only about 1/2 inch in diameter 
ITW BRANDS 11362 3/16x5-1/2-Inch Concrete Drill Bit | eBay
