Rubber Edge Trim for a 28 Gauge metal requires a 1/64 inch opening or 0.396 mm
Rubber Edge Trim for a 16 Gauge metal requires a 1/16 inch opening or 1.587 mm
Rubber Edge Trim for a 13 Gauge metal requires a 3/32 inch opening or 2.381 mm
Rubber Edge Trim for a 11 Gauge metal requires a 1/8 inch opening or 3.175 mm
Rubber Edge Trim for a 7 Gauge metal requires a 3/16 inch opening or 4.762 mm
Rubber Edge Trim for a 3 Gauge metal requires a 1/4 inch opening or 6.350 mm
In my opinion, the rubber edge trim extrusions with the rounded back look better than the straight back edge trim extrusions. When the edge is exposed they also go around sharp corners a bit better. Also very important to get the correct edge trim opening for your application, never try to put a smaller rubber edge trim extrusion opening over a thicker item. It will not work out well. A slightly larger opening rubber edge trim extrusion can be made to work with a bit of glue or if it is butted against something it would not matter.
On each listing, you will find a chart for the different gauge metals to help you decide which of our EPDM rubber edge trim U channel extrusions would be best for your application