This product is an excellent idea, it simplifies bike lock up. Delta however, executed it with the cheapest materials possible. I stripped the rear axle as I was first installing it. It was just beginning to tighten up, so I know I didn't over tighten it. The front one held up a little better. I was able to change flats at least twice before it's threads gave up. I'm gonna give PinHead locking skewers a try instead.