Big Gator Tools MDG1000NP V-Drill Guide Universal & portable V-Drill guide provides perpendicular alignment of drill bits on flat, round or square materials Includes 17 metric drill sizes: 3mm, 3.3mm, 3.5mm, 4mm, 4.2mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 6.8mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm Heat-treated nickel alloy steel provides durability & accuracy Precision ground base provides perpendicular alignment of drill bit on flat surfaces