【Hidden Shelf Brackets Size】Rod is 3 inches long with Mount Hole Size: 12 x 5mm/0.47" x 0.2"(L*W); Mount Hole Distance: 42mm/1.65";Shaft Size: 10 x 70mm/0.4" x 3"(D*L); Rectangle Base Size: 70 x 14 x 4mm/2.75" x 0.55" x 0.16"(L*W*T). Support floating 3.5-7 inch deep wooden shelves.,【Durability & Heavy Duty Support】Blind shelf supports are made of solid steel with nickel coating to resist rust and corrosion. Thicken base and rod design to provide sturdy and durable support for your shelf, support up to 30lbs.,【Invisible Design】Hidden brackets work perfectly to turn an old reclaimed barn beam into a floating shelf. The brackets will hide inside the shelf, create shelves that appear to float on the wall, beautifully modern visual display or storage.,【Widely Use】Floating shelf brackets are used in living room, kitchen, bathroom, bedroom, study room, office & more, you can put books, kitchen dishes, large mantles, plants, decoration stuffs on the shelf.,【Easy Installation】No special skills are required to mount these shelf brackets on wall. Just simply drill a hole in the shelf to fit the diameter of the rod and screw into the wall. (NOTE: Use in drywall, concrete wall or the brick wall.)