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Amazon [amazon.com] has 2-Pack 4" Prime-Line Corner Bracket is on sale for $ 3.19. Shipping is free w/ Amazon Prime or on $ 25+

Product Description from Store[LIST][*]Constructed of heavy duty steel and bent to 90-degree angle[*]Comes in a corrosion resistant, galvanized finish[*]Designed for use in chests, on windows, furniture, framework, and many other applications, both indoors and out