https://www.mccoys.com/shop/p/7162282-052303-28/national-hardware-v1875-series-n213-389-corner-brace-1-in-l-brass-solid-brass-4-pack
V1875 Series N213-389 Corner Brace, 1 in L, Brass,
National Hardware V1875 Corner Brace, Brass, Solid Brass, 1 in L, 0.06 in Thick, Includes: Screws
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