I bought this new online and installed it about a year ago. I think it's still sold new. I'm selling various items because I'm getting rid of my bike. My subjective impression of using it: This type is secured by passing zip ties through the holes on the back. It was durable and reliable. I had no concerns about it. The white powder you see is mink oil. I occasionally applied mink oil and hose oil for maintenance. The bottom diameter is about 10cm.