The 1591MS100BK is a 100-pack of black M3-0.5 x 10mm assembly screws for Hammond small plastic enclosures. It is suited to builders and service technicians who want replacement screws in black to match dark enclosures across the 1591 and related series.

The series hardware list names six applicable series for this pack: 1591, 1591XX, 1591T, 1599RFI, 1598 and 1598R. It classifies the part as assembly screws, the fasteners that hold the enclosure together. The short description reads "1591 M3 X10MM SCREW BLK 100 PK".

The screws are steel and the colour is black. There are 100 screws in each pack, with a shipping weight of 0.12 lbs (0.05 kg). The 1591MS100BK is RoHS compliant and REACH compliant.

If your build does not need dark hardware, the hardware list also includes the same M3-0.5 x 10mm screw in a non-black 100-pack. In most cases, enclosures include all hardware needed for assembly, so this pack is meant for replacements, spares and additional stock. Hardware packs may not be compatible with all parts in the listed series, so check your enclosure's replacement parts and accessories list before ordering.