Used, as everyone knows. A gem that came out while cleaning. Product Name: Metal Chain Joining/Separating Tool Accessories: 4 punches (1.8□, Φ3, 5, 6mm) Remarks: Select from various metal chains, align with the holes, and drive in the punches to join/separate the metal parts. Ideally, having a surface plate would be convenient as it makes the work smoother. *A separate metal hammer is required for the work. Photo ①: Set contents Photo ②: Chain parts - Front Punch - 2 types (Φ3, 5mm) Photo ③: Chain parts - Side Punch - 2 types (Φ3, 5mm) Photo ④: Chain parts - Back Punch - 2 types (Φ3, 5mm) Photo ⑤: Punch - 2 types (1.8□, Φ6mm) Side Photo ⑥: Punch - 2 types (1.8□, Φ6mm) Contact/Operating part Photo ⑦: Punch - 2 types (1.8□, Φ6mm) Striking point ＜Chain Part Sizes＞ From largest to smallest. (Locations a, b, and c refer to photos ① and ②) 1: a・97.5 b・46 c・45 2: 85.8 40.8 36.8 3: 71.9 33.8 35 4: 48.6 23.3 22.3 5: 46.4 15 13.7 6: 37 18 17 7: 37 18 17 8: 30.9 15 13.5 ＜Punch Sizes＞ Square Punch: 1.8□mm Large Round Punch: Φ6mm Medium Round Punch: Φ5mm Small Round Punch: Φ3mm