Our Best 3.5" Dry Core Bit. Great for dry hole drilling appliactions into asphalt, green concrete, concrete, hard concrete, field stone, pavers, clay pavers and hard brickBZ-CBD350 3.5" Dry Core BitSKU: BZ-CBD350$199.95PriceQuantity*Out of StockNotify When AvailableSPECIFICATIONS3.5" X .140 X 5/8-11, 10" BARREL