Thank you for viewing. This is a CYCLUS headset press-in tool. I've only used it a few times, but due to long-term storage, there are some areas with rust. I applied rust inhibitor, which has resulted in some staining. There are absolutely no problems with the press-in parts. Thank you. A metal tool perfect for adjusting bicycle headsets. - Type: Headset-related tool - Material: Metal - Application: Bicycle headset adjustment