Received these and was surprised they weren't regular nuts. They require a special add-on. Then I put them on and they chipped straight away. Well, I guess I can't change that. Then, about a week later, I noticed one fell off! I was so surprised. Then I replaced her with my elderly mother. Dressed perfectly up to the moment of dressing and hoping for the best. About a month later I noticed that 6 were missing! They are NOT holding their threads properly! DO NOT BUY!