This is a simple hand/nail brush holder I did. It fits brushes with about 45x35x80 mm - the brush is inserted from the top and there are two wings that hold the brush in place. There are 2 screw holes (diameter 6mm, 19mm distance) for a wall mount.

This is my first upload and I did this thing in the first place because I needed a plain brush holder that has screw holes which fit on the already exisiting holes on my bathroom wall.