Thank you for viewing. This is a lightweight and easy-to-carry aluminum U-lock. I bought it for my motorcycle, but the inner diameter didn't fit, and since I don't own a bicycle either, I just put it away. The instruction manual shows some slight stains due to aging. - Type: Aluminum U-lock - Inner Diameter: 71mm, Width 51mm - Body Size Including Arms: Approximately 12cm x 11cm - Accessories: 3 dimple keys Although it is unused, please understand that it has been stored at home. If you are considering purchasing, please make sure the inner diameter fits before making your decision. Immediate purchase is welcome. Thank you for reading to the end.