Files are sized by length and by their thickness (shorter files are naturally thinner to start with). Then, there is a variety of sizes available in each length... This is what follows after the length, e.g. a 6" 'Slim Taper'.
Something I am always asked for are the saw filing templates in PDF form that I made for my backsaw project. They're the ones that are just lines on a page showing an angle to file a saw at or lines showing ppi to aid in cutting new teeth, like in this shot:
There were a few sizes missing - I made some additional templates to cover more sizes and angles, hopefully these will help you out.
I've compiled them all into one document and put them here:
They are all in PDF format - if you plot them without scaling them to fit the page (no scaling, in other words), they should print to scale properly.
EDIT: For those daring types, here's a pair of progressive pitch templates, one for 6 ppi - 9 ppi Toe to Heel on a 9" (22.86cm) blade similar to Lie-Nielsen and another that is 7 – 13 PPI over 14” similar to their progressive-pitch filed tenon saw...
Someone asked me recently about what I use to protect the finish of my saws (and by proxy other tools, both hand and machine tools). The answer is straight forward, though perhaps not as simple as I initially thought… I use paste wax to help protect them from rust and also to reduce friction in their use. I also use paste wax on some of the furniture I make and restore also. I have often sensed a bit of confusion on using waxes, what they are and how they work, in conversations I've had with others. Some revile it – likely because of a bad reaction with a finish of some sort or perhaps in some cases because of unrealistic expectations.
I've been getting a few questions lately on saw files - what to get, and where to get them, mostly. Here's some highlights from those correspondences that others might find useful. Read more about Finding Files and Other Saw Sharpening Tips