These flat-head phillips machine screws measures 19.05mm long, 3mm diameter at the end, and 6.5mm diameter at the head. Available in sets of 2, these fit the Neutrik brand series of USB and RJ45 connectors. (Note: All Neutrik brand connectors available at focusattack.com come with the screw and nut set). These make a great replacement set in case you lose your original set.
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