Friction spanner (31 K) with exchangeable UD profile or bi-hexagon insert rings (31 R), Hexagonal rings available on request, Especially suitable for steel and scaffolding construction, Up to 30" flat shaft, from 35" with slip-on tube, Vanadium steel 31CrV3, manganese-phosphated, Explanation of the article number: 31 KR 16-32 = ratchet 31 K 16" and insert ring 31 R 32 mm