I only put three bits in the set because I had a problem with the set, but a problem I was able to fix. Otherwise the attachments appear to be well made. The fact is that the tongue created by one nozzle is longer than the deep groove created by the other nozzle. When testing the joint, it feels very wobbly. This is because the tongue was lowered before the shoulders of the joint touched. I measured: the groove is pretty much exactly 3/8 inch deep. The tongue is almost 7/16" long. I removed about 1/16" from the tongue. Now that I test the hinge it feels secure. I'm an amateur so I don't want to pay the very high prices which are required for premium beats. Since I can work around the downside of this set I will continue to use this set. Perhaps when I get around to it I'll disassemble the bit that creates the groove and put in a slightly smaller bearing. This will cause the tongue to go deeper and fix the problem.Not today though.