Used with Albrecht 1/32-1/2" chuck on my mini bit (P/N 8530). Seam quality is pretty good, micromachining is nice and clean, no dents or noticeable imperfections, taper has didn't think to check for runout before chucking, but after reassembly the runout is around 0.002, although I have no doubt that most of it is in my (old and worn) .