After not finding good assortments online that have the longer M3 x 25mm screws that most of the hotend mounts need we decided to spec out our own assortment kit. See below for all the sizes, lengths, and quantities included.
M3 – 8mm, 12mm, 16mm, 20mm, 25mm – 20 of each
M4 – 8mm, 12mm, 16mm, 20mm – 20 of each
M5 – 8mm, 12mm, 16mm – 15 of each
100x M3 Nuts
80x M4 Nuts
45x M5 Nuts