The sizing of the clips works as follows:
- C451 size - fits 19mm diameter mic
- NT5 size - fits 20mm diameter mic
- KM184 size - fits 22mm diameter mic
If you don't have a micrometer to measure the diameter you can always use a string and wrap it around the part where you would put the clip and mark its length. Lay this string out and measure it's circumference (C).
Diameter = C/3.14
You want to size the clip on the tight side. ie if it is 21mm use the NT5 clip size not the KM184. The clips will stretch and accomodate up to about 1.5mm (larger) in size but will be tight.
My clip seems to small when I measure it and I am afraid I might break the clip?
Some people think that the clips are like a normal microphone stand clip and the mic will slide in so the clip must be slightly larger than the microphone at rest. This is not the way they work at all. The curve of the sides is such that when under tension they accommodate a microphone of the design dimensions while applying enough force to be able to carry the weight of the mic and a similar mic and its cable.
The NT 5 mic clip is perfect for a 20mm mic but will stretch for up to a 21mm microphone. The mic's snap into the clip. Some people get a little freaked out by the fact that they require a fair amount of force to push them on but they would not be able to support the microphones if they were not this way.
If you don't feel comfortable using a mic clip that snaps on like these are designed to you certainly could return them and we would refund you your money. We have worked with a few people that think the clips will break if snapped on but they won't. They are made of the same material that Lego's is made out of and are pretty well indestructible. If you break them while putting them on a microphone of the correct size we would just replace them.