104HP Eurorack Enclosure 
Precision machined aluminum
White Powder Coated with a satin vintage tone and fine texture
Fits all wood ends and daisy chains offered by Catskill Analog
4 interior screw mounts fit flush into inner side of metal and create a full clearance for modules, as well as a very secure mount
Forward compatible with all future wood/end/stand designs to be released
40 M2.5 sliding nuts and screws are pre installed. That gives you 20 mount points in top rail, 20 mount points in bottom rail. Select silver screws or black screws in product options.
If you seek #4-40 nuts, those are Vector brand part# NT4-7PA which can be purchased via various places online in packs of 25.