These corner brackets by Prime-Line Products are constructed of steel and come in a corrosion-resistant galvanized finish. The brackets come in an L-angle shape, and each leaf has two (2) offset mounting holes. Corner brackets like these are often used in chests, on windows, furniture, framework, etc., to reinforce right angle corner joints, and for bracing and securing multiple applications. The mounting holes are countersunk to allow flat head screws to sit flush with the brace.