The 1720420401: Silver contact finish at 100.0µin (2.54µm) thickness is the standout here — most power headers in this class use tin or selective gold. Silver gives lower contact resistance at first mate and sustains it over more cycles than tin, but it tarnishes in sulphurous environments. For sealed or clean indoor gear the silver holds up well; for outdoor or engine-bay exposure, verify the mating housing provides an environmental seal. The thick plating also handles the blade wipe-in force of the locking ramp engagement without galling.
Finger-proof feature on the header shroud protects against accidental contact with live blades — a useful safety detail for unshrouded power headers in service-access areas. The locking ramp requires the matching receptacle housing to have the corresponding ramp catch; confirm the mating half part number before committing the assembly.