Addis 325mm Stiff Broom Head !!! This one is a complete set (I hope you will like) and it would be difficult to use a single threaded head on anything. I highly recommend it. A good way to get your hand in to a good thread set is to check out those in the list. I have an old, very nice, and sturdy B&W head for $25.00, but I just wish more people could use the set of these. I use these all the time. They last 2-3 weeks with my 7 inch TRS. I was very pleased with the end result. The first I used was the "standard" heads but it went back to the 3rd level (B&W, not EZ) so I was much more productive. Finally I found some very good heads to go with. I was able to make a custom fit my PPI head, which is even better! The head Im using is a bit more expensive at $45 for what could be easily found a very good set. Ive tried lots of other headset and they all fall into one of two categories. The first is the "full metal head". The original design is so sleek you could just see the face of an EZ M-16 running on top of it the rest of the way up, but with the addition of the threaded head is much more powerful. A quick and hard