The Reg-Fix PG10-MB powRgrip microbore collet claims concentricity of less than 3 µm at 3 x D even with the tiniest diameters. PG10-MB microbore collet is available in size PG 10 with diameters ranging from 0.2 to 1.5 mm.
When using small diameter tools, it is not the radial forces that are the problem but the inaccuracies caused by the runout which are transferred to the tool.
