Bahco saw file sizes

[Kees Heiden]

I would like to buy some packages of sawfiles and while browsing the Bahco catalogue, something peculiar caught my attention. What is really the difference beteen slim, extra slim and double extra slim?

Tyhey show this picture:

When I look at a slim, then a file with B= 6mm has a length A of 100 mm (4").
The extra slim: B = 6mm, then A = 112 or 125mm4.5" or 5".
And double extra slim for B = 6mm has a length of 6".

So, under what circumstanbces would I use a slim versus a double extra slim? In my primitive look on things I would say, take the longest possible file for a given size of B. They all have cut 2 and all have about the same tpi (23 or 24 teeth per cm).

Maybe the radius of the edge differs?

[Jim Davis]

Pretty sure you have the dimensions of the slim and double extra slim exchanged. I do think the radius of the edges is smaller on the double extra.

[Kees Heiden]

No I don't have them exchanged. At least if I can trust the catalogue. The 4" slim is of course the smallest slim file, while the 5" double is the largest.

So, it is up to me to decide which ones to get. Is there any rime or reason to the choice of file? Why would you choose a file with a larger radius?