Utility Knife Blade holder - Medium size - for 61X19mm blades... No screws required .
just plastic and blade... Easy to install - as shown in the picture - closes with a click similar to a folding knife.

Note: You may need to file down the area of ​​movement if there is a large sim due to the printing.. Apply a drop of oil for smoother movement

Note2: There are two screw files; you only need one. Choose one. There are also two side files—open and closed—choose one as well. See the assembly image.

Note 3: Print the following files with 4 walls for strength. BH 1-2-3.