Material: CrNiMo stainless steel, manufactured in accordance with EN 818-2. In short chain link distances, the approval of grade 8 is documented by the responsible DGUV (BG). H1 means manufacturer number 1 = RUD. 8 means corresponding to grade 8. Proof of quality: A production and lot number is stamped at regular intervals. This identification possibility guarantees a complete proof of the production and test data, even after 10 years. We stand by our RUD quality.