3/8" Diamond Coated Core Drill (10.0mm) - Made In USA,Lasco Diamond Products, Inc.,3/8" Diamond Coated Core Drill (10.0mm)" /> 3/8" Steel Shank - Hole Size Approximately 10.0mm Great for cutting 8.0mm holes in stone, glass, wood, tile, and more - Perfect size for making clocks Coated in 100% Natural Diamond (not synthetic) U.S. Made - High Quality - Concentricity Guaranteed Works best on a drill press