This is a Mr Hobby Mr Modelling Saw Large Blade [GT124]

Mr.Modeling Saw Large Dedicated Blade (0.1mm Blade)

--Mr. Modeling Saw Large is a replaceable blade type saw for cutting parts.
――The standard blade (0.1mm) attached to the main body demonstrates outstanding cutting power for plastic materials.
--If the sharpness is reduced, please use the special blade (GT124) sold separately.

――You can easily replace the blade with your Phillips screwdriver.

--Blade length: 118mm / 0.1mm thickness
- made in Japan