Based on this product's specifications, here are some alternatives and similar models
Chain lock FISCHER PROTEC PLUS+ CK100 — robust steel chain with 4-sided links, model 50746
Summary description:
FISCHER PROTEC PLUS+ CK100 is a chain lock featuring a robust steel chain with 4-sided links designed for secure locking of bicycles and other valuables. Supplied under model 50746/ EAN 4008153048630, it offers heavy-duty resistance to cutting and tampering thanks to its solid construction. Ideal for everyday outdoor use, it provides reliable security when parked in urban or suburban areas and is compact enough for transport.