Just a simple insulation rail joiner for LGB. It's made for standard Code 330 (LGB, Aristocraft etc) and you should use a M2.5 screw and nut, preferable A2 or A4 stainless steel.
2016-09-30: I've added my updated version. It uses the same type of bolts but have a much better clamping force around the rail. Also added photo of version 2. Works like a charm :).