I paid about $25 for 4 iron shelf brackets. That's about half the price at big department stores like the HD and L. They're strong, durable, and well-made pieces. They came with the right size screws to attach both the 1/2 inch thick shelf to the wall and the shelf itself. Secure, stable attachment with perfectly aligned screw holes. I used them for a melamine shelf in the garage to store mountain bike gear. So far, so good.
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