WINKER Countertop Support Bracket 1 Pack Heavy Duty Hidden L Shelf Bracket 10" x 6" x 2.5" Metal Corbels for Quartz/Granite/Wood/Concrete/Laminate Countertops, Black

these are heavy duty brackets

These are so strong and definitely feel strong enough to hold up the weight its rated for. All depend on how you fix them. Metal is soft enough to easily drill the holes large to allow larger fixings, as I used M8 bolts and kemfix to attach to the wall to support worktop

These brackets are extremely good quality. They are very heavy duty. We are using these brackets to support 12' x 16" x 2" black walnut shelves. I have no doubt these will support the weight easily. The welds are also done very good, as well as the coating/ finish. I did find that the screws provided for wall side did not fit the hole properly. I contacted the seller and they were extremely responsive and worked with me to get the correct screws. I have never dealt directly with a seller in China, and was very impressed with their willingness to help and make their customer happy. I will definitely purchase from them again. Great product and service.

Totally sturdy, very heavy duty

WOW I love these, they are heavy duty, Much stronger than I need but I know that they will not fail. They look good too.