Steel shot and steel grit are the two most common metallic abrasive types. Steel shot is a spherical shape, and it will create a smooth texture on the substrate surface. Steel grit is randomly angular and will etch and erode the substrate surface. Each of these abrasives is available in various hardness and size options, which are compatible with different substrates. They are also both heavy-duty abrasive materials that can quickly penetrate and remove surface debris baked or caked on.