Some of these parts were flared and some were larger than the 21mm size I ordered, the presses may not have been cleaned or calibrated often enough. Certainly quality control needs to be improved. I used a bead of silicone in one edge of each lid to hold them in place until the next time I need to take them off. hope it lasts They are also much lighter than in the photo. The satin spray paint and clear coat adhered very well to it.