Some of the best ideas are the simple ones. Combining a clear base with a vee groove and interchangeable steel bushes, this jig allows you to drill vertically and position it accurately on a flat surface or using the vee groove in the base on a corner, or centred on a cylinder or a sphere, both notoriously difficult shapes to drill into with any degree of accuracy. With metric bushes to suit drill sizes 4, 5, 6, 8,10 and 12mm.