An electrical for connecting an electronic package to a printed circuit board, includes a housing and a plurality of contacts therein. The contacts include grounding contacts and signal contacts mixed with each other. The housing includes an insulative plastic body and a conductive plastic body wherein the insulative plastic body includes a main plate and a plurality of columns extending downwardly from the main plate. Each column forms an insulative retaining passageway for receiving the signal contact. The conductive plastic body includes a block with two opposite top and bottom surfaces, and plurality of conductive retaining passageways for receiving the grounding contacts, and a plurality of receiving cavities for receiving the columns are commonly formed in the conductive plastic body in a mixed manner.