This is the original 90° SATA connector THROUGH, manufactured in the USA by the MOLEX company. The THROUGH version is made for wires going through the connector, so you can install them in a row of multiple connectors. The cap of the THROUGH connector is open on both sides, for the pass through of the wire. Only for the last connector on the wire, the version of the 90° SATA connector is needed, where the cap is closed on one end to cover the open wire core end.
The wires (18 AWG, 0.75 mm², 17 AWG 1.00 mm²) are simply pressed down completely into the "blades" of the connector with a flat screwdriver or similar wide object, while you hold the connector stable on a surface. The "blades" of the connector cut through the wire-insulation and make contact to the wire core. You can see the procedure on the second photo in the product gallery.
A different league in the world of connectors. The highest precision connectivity with 100% specification matching, by the company which makes the specifications - the MOLEX company.
Enjoy the original!