Abstract: A back plate has a metal body with at least one through hole defined in the body. A grounding member formed on one edge of each through hole. The grounding member has a straight long portion, a short portion and an arcuate portion. The long portion with a first end leads from the periphery of the at least one through hole. The short portion with a first end separates from the periphery of the at least one through hole and is formed substantially in line with the long portion. The first end of the short portion is directed towards a central portion of the at least one through hole. The arcuate portion extends between second ends of the long and short portions. Accordingly, the grounding member can reliably contact with the casing of the connector due to the resilience provided by the grounding member.