Bought these for our new kitchen, thinking they would be great quality and am so disappointed! 12 if the 16 knobs have broken! The glass ball is very heavy and is attached to a metal post. The recessed area where the two pieces attach seems too shallow and even with special glue the cabinet maker can’t get them to hold. Wayfair is replacing them - I’m hoping that it’s just a faulty batch. It will be hard  to find other knobs with the same diameter post to fit the drilled holes.