The Amphenol FCI 87185-128HLF is a 28-position unshrouded male pin header from the BergStik II series, built for board-to-board stacking on a standard 0.100-inch (2.54 mm) pitch. Typical use is as a mezzanine interconnect or a wire-to-board header when paired with the matching receptacle.
The 0.100-inch pitch is the classic breadboard and prototype spacing — it fits standard perfboard and mates with any BergStik II or compatible 2.54 mm receptacle. That plating thickness gives you a solid number of mating cycles for production test or field service without fretting corrosion. The 110 V rating is the working voltage between adjacent pins — fine for logic-level and low-voltage power rails, but derate if you're switching inductive loads near the limit.