but is there a problem with mine,
Yours are adaptors, they adapt a male RCA to a male BNC. They're not chassis mount connectors, how would you mount them?
Also, they're not gold plated...you don't want any gold plated connectors because they'd be very expensive and the gold will rub off the first time you mate them.
The metallic yellow colour, that they call 'gold', is cadmium chromate...it offers much better protection than gold.
You can buy these locally as well.