For concrete or masonry walls, use appropriate wall fasteners in all four mounting points.
Concrete screws must be at least 3/16 inch. Each of the four screws must be rated for 14.6 kg (32.2 lb.) minimum.
Typical drill size is 5/32 inch for the 3/16 inch concrete screw. Follow the manufacturer‘s instructions, including the recommendation for drill depth.
You can use concrete inserts, such as conical lead or flanged polypropylene, for installing the rack mount bracket in concrete. Each insert must be individually rated to support 14.6 kg (32.2 lb.) minimum.
Use sizes that support a #10 screw minimum.
Typical drill size is 5/16 inch for the #10 conical lead anchor for concrete.
Typical drill size is ΒΌ inch for the #10 flanged polypropylene anchor for concrete.
Follow the manufacturer‘s instructions, including the recommendation for drill depth for the insert that you are using.