Please note that this handcuff model is intended purely as a toy or prop. It is not meant for real restraint or security purposes. The design does not require keys to unlock, ensuring no safety concerns about being locked or trapped. I share this creation enthusiastically but want to emphasize there is no risk involved with its use. Thank you for understanding and respecting this! This model requires screws for assembly: 2 pieces of M2×8mm, 2 pieces of M3×8mm, and 12 pieces of M2×6mm.