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The socket is stackable !!! Choose the "with socket" option. With the socket=yes option, the 10-pack is a very good deal ! (with socket=no best to select N pieces instead of 10-pack) Although nominal maximum current for this small relay is 30A, bigger ("normal size" 30-40-50A) relay is recommended above 20A. Make sure to crimp well and ensure strain-relief so that the connection does not get lose or come off or get damaged.