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Mr. Diamond file thin cutter holder (#1000) According to the Mr. Hobby website, the file (actual metal part) has a cross sectional dimension of 9.0 mm × 0.3 mm with a length of 80 mm. Further measurements are my own. The file extends ~60 mm. The length of the plastic holder is ~130 mm. The plastic holder appears to be originally designed for a snap-off retractable blade from an unknown Japanese brand. This appears to be common practice among certain hobby companies – like how the Tamiya scriber and cutter from the basic tool set are both Olfa branded.
The function of the tool is familiar if you have used any retractable cutter. The plastic knob works as any standard screw ("righty tighty, lefty loosey") and is used to extend the file and hold it to whatever length of your choosing, up to ~60 mm. The screw, although plastic, does hold quite well. The thickness allows it to fit in very low clearance areas, however I have found the 9 mm width often limiting where it can be used. Although the thickness is overall a positive, it does have a drawback – it must be used very gently. It is very flexible and can easily bend with pressure. Given that it is #1000 though, it should be used gently anyway.
Although highly flexible, the file feels of good quality. The business end of the file comes to a square edge with (very) sharp corners. I have not had any issues with accidentally gouging pieces due to the sharp corners, but I can see how this could become a problem. The holder feels cheap. After all, it's just a plastic handle. However, it does hold the file in place securely and is otherwise comfortable to hold.
Overall, the file feels reminiscent of those inexpensive nail files you can find in many bargain shops. I don't believe I have seen one in this grit, though. Although the thickness of the file is what drove my initial purchase, I would suggest one save their money for a more robust file with a proper handle, like the other files in this "Takumi no Yasuri" series. The MF07 comes to mind, which is 0.5 mm thick and has a handle. I believe the grit count is higher on that one, though.
∙ thin size allows for use in low clearance situations
∙ holder holds file securely in place
∙ high cost
∙ high grit count often limits use
∙ overall inexpensive feel
Thanks for reading!