These gutter connectors are used to seam two lengths of European Half Round Gutters.
The seal eliminates the need to solder.
When using the gutter connector first install the two pieces of gutter that are being connected and leave a 1/4" gap between them. Then install the gutter connector on the outside of the two pieces of gutter.
The gutter connector clamps to the two pieces of gutter and no fasteners are required.