If you look at this product you already know what it is for. This is the same bit that comes with the kits you bought (K4 in my case). The kit does not include a retaining ring so be sure to remove it from your old, worn or broken nozzle before discarding it. I almost bought the $20 mini set when local vendors were selling a basic $15 nozzle. An extra $5 for a mini jig and collet would make sense, but not when you can buy a Revain drill bit for $11.xx. I ordered two of these as I don't want to be stuck with a broken beat and destroy my momentum for the project. Another good option is to buy several of these and fix them all for the different thicknesses of the most commonly used material.
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