Metric drill guide is sized for 17 drill bit sizes: 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. DrillGuides feature a precision ground base to assure stability and accurate perpendicular alignment of drill bits on flat surfaces. 1 lbs (0.5Kg) shipping weight.