Questions and Answers for Onward 19-5/8 in. (498 mm) x 13 in. (330 mm) White Steel Heavy Duty Shelf Bracket

A:  1.25"

A:  Kitchen tops are 24" deep, so yes these would be adequate but laminate tops have a nasty habit of bowing when not supported properly. It may seem like overkill but I'd support the countertop every four feet to keep bowing to a minimm

A:  Any kitchen countertop would normally rest upon, be attached to and supported by the base cabinets. That said, these brackets are substantial enough to support a properly-attached freestanding laminate kitchen countertop. Space the brackets to ensure that the load on the countertop between adjacent brackets does not exceed the capacity of the countertop material.

A:  The dimension of the product is 15.75 inches in depth, 10.625 inches in height and 1.1875 inches in the width.

A:  Anchor holes are 8.3mm, or approximately 5/16".

A:  Yes

A:  Yes, you can use this bracket for a 12-inch shelf.

A:  Yes.

A:  Vertical: 1.25",3.25", and 11 15/16" from the top corner. Horizontal: 1 5/8", 5 1/8", and 18 5/8" from the wall.

A:  Tap cons

A:  The best way to mount these brackets in Concrete is to use Power Driven nails any other way will be a hassle. Use small washers so the nail head doesn't pull through the hole to mount the bracket.

A:  3 inch Long masonry screws

A:  Length: 20 in. Width: 13 in.

A:  Yes, Each bracket can support up to 1000 pounds.

A:  Use anchors...

A:  You always need to mount the brackets on a wall that has 2x4 or 2x6 studs under the dry wall and use lag bolts on the brackets. Minimum size 1/4" by 3", reason being over the years someone will always try to hang something heavier than should be.