The 20021121-00004C4LF: Termination is solder-only — this is a surface-mount header, no through-hole option. The post finish is tin (50.0 µinch) for good solder wetting to the board pad.
Position Count vs the 6- and 8-Position Siblings
The 4-position version (20021121-00004C4LF) is the smallest dual-row member in this Minitek127 SMT header family. If the BOM calls for 4 circuits, this is the part; if the layout has room for extra pins for mechanical stability or future expansion, the 6- or 8-position versions drop into the same footprint family.