Yeah when I bought a deng booster I put it on and the bolts seemed tight. I thought they must be fine there the right size. All on ok, then a few weeks later I was tweaking the brake and tightened the last one up and it striped the thread. Now I have a new frame and have the booster on it and one of the bolts has rounded of and I’m sure its about to strip the threat So I think the bolts are to big if you can believe it Deng is just to mass market Edit: the bolts were to big to fit through the holes in the booster, so i had to file it out a bit.