From DCC Concepts site:
Exclusive to DCCconcepts! We had these strippers made for us based on a pair I’d used for over 20 years. We also arranged for our manufacturer to add a second stripping groove and a razor sharp cutting edge between them for neat clean wire trimming that my original didn’t have! These are the best there are, anywhere and the ultimate stripper for fine work. The locking adjustment lets you set them in any position so you are guaranteed to strip only the insulation, not the core. Adjustment is so fine you can take the strip size as high as 3mm – or as small as 0.1mm.