Drill guide ensures perfect perpendicular drilling on flat, round, or square workpieces, with a built in V groove. High-precision CNC machined construction and laser engraved with accurate scale markings, complemented by a protective black anodized finish. Heat treated and finished with electrophoresis for long-lasting strength, stability, and accuracy. Wide range of 17 Metric precision holes: 3, 3.3, 3.5, 4, 4.2, 4.5, 5, 5.5, 6, 6.5, 6.8, 7, 7.5, 8, 8.5, 9, 9.5mm.Model No. MG2M