I am starting to get info for building my own machine.
Next is a photo from a kit that is sold. It is supposed to be an SBR16-SFU16 with BK/BF 12

I really can't understand the profile used.

According to the specifications, SBR16 has a 30mm gap for the screws. Then BKBF has a 48mm gap. How is SBR16 and BK/BF are in the what seems to be 30 profile?
I thought maybe the picture shows SBR10 or SBR12 but then again the numbers do not match.

What profile is this? What do we see in the picture?

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