These are custom stainless standoffs made using 304 stainless steel material in accordance with ASTM A276 and passivated to ASTM A380.  Approximately 100,000 pieces were produced domestically with full certifications.  4-40 thread was incorporated on both male and female parts, with the male part measuring .750 inches and female hex measuring .320 inches in length.  Width across the flats on the hex measures .250 inches.