Dry Diamond Drill Bits Set 10 PCs 1/4" 6mm Small Diamond Hole Saw Kit for Granite Marble Porcelain Tile Ceramic Stone Glass Hard Materials (not for Wood) Round Shank - Amazon.com
Drill Size Chart - Machining
POWERTEC Steel Drill Bit Stop Collar w/Split Ring Design and Size Markings 3 mm, 4 mm, 5 mm, 6 mm, 8 mm, 10mm, 12mm (7-Piece Set) 71492 - The Home Depot
High quality, superior performance drilling and driving accessories made with pride in the USA.