These surface plates are typically used as reference surfaces for measurement instruments such as micrometers, height gauges, and dial indicators. They can also be used as a flat surface for marking out and inspecting machined parts.

B-Grade Black Granite Surface Plates are available in a range of sizes, from small handheld plates to large floor-mounted plates that can weigh several tons. They are typically black in color, but some manufacturers offer other colors such as pink, gray, and green. These plates are often preferred over other materials such as steel or cast iron due to their superior stability and resistance to wear and corrosion.

While B-Grade Black Granite Surface Plates are less accurate than A-Grade or AA-Grade plates, they are still suitable for many applications where a high level of accuracy is not required. They offer good value for money and can be a cost-effective option for applications where tight tolerances are not critical.