A spacer frame assembly and method of assembly includes a substantially linear channel having first and second ends. The substantially linear channel that when assembled includes at least four sides and corresponding corners between each of the sides. The spacer frame assembly also has a connecting structure located at one of the first and second ends and an opposite frame end located at the other of the one of first and second ends. The opposite frame end has an inner channel for receiving a nose portion of the connecting structure. The spacer frame assembly also includes a stop extending from the connecting structure for locating the opposite frame end when in the assembled position.