Co-extruded insulated edge guard

A method of making an insulated metal edge guard comprising providing a one-piece metal channel preformed to a desired cross sectional shape, such as a U, C, J, or V, having a generally semi-circular base from which extend inner and outer legs with distal end portions via which self-retention forces are exterted when the insulated metal edge guard is put to use on an edge, and passing said metal channel through a co-extruding operation to co-extrude insulating material onto the metal channel such that the insulating material covers said distal end portions of said legs, said method including the steps of making a concave crevice in one of said metal channel and said insulating material at one of said distal end portions such that said crevice's concavity is open back toward said base and at an acute angle to the leg containing said one distal end portion, of disposing a projecting portion of the other of said metal channel and said insulating material at said one distal end portion within said crevice, said projecting portion of the other of said metal channel and said insulating material projecting relative to the leg containing said one distal end portion at the same acute angle as the concavity of said crevice, and of forming in said insulating material at said one distal end portion an enlargement on the interior of the leg containing said one distal end portion, said enlargement having a surface substantially parallel to the leg containing said one distal end portion.