These Swiss Preci-dip IC "Hard metric" PCB Socket Connector headers are solder tail Through Hole or SMD perpendicular Gull-Wing mount.
Sockets have Tin plated Brass sleeves with Flash Gold plated Beryllium Copper (4 finger) contact clips The Through Hole headers have a Pin length of 3.2 mm Suitable for Mating Pin Ø 0.4 → 0.66 mm or 0.5 mm square