English to French Tech/Engineering Mechanics / Mech Engineering shutter; hinge

-"The reinforcing tie is formed as an angle bar when used e.g. in the corners of the shutter"
-"Reinforcing tie 1 consists of a flat reinforcing angle bar 2 each leg thereof being formed with a plurality of preferably uniformly spaced through-holes 3."
-"If needed, said angle bars 2, 4 assembly could also be used where only a corner reinforcement of a frame or a shutter is required."

S'agit-il de cornière ?
Merci.