L-Plate: The overall length of the L-Plate is 18 mm (0.7") longer than the specification length (L). The specification length is the total distance between the exterior face of the insulation to the exterior face of the structural backup wall component that the L-Plate is fastened to. The L-Plate is available in specification lengths (L), of 0 (0"), 28 (1.1"), 41 (1.6"), 54 (2.1"), 67 (2.6"), 79 (3.1"), 92 (3.6") and 105 (4.1") mm. Intermediate sizes are also available.