Granite countertops tend to be offered in 3 levels of grade. Level 1 is entry grade, level 2 is mid-grade, and level 3 is high grade. Level 1 entry-level grade is the lowest grade of granite available on the market. You may also hear it referred to as commercial grade. Commercial grade is often a thinner cut of granite that is likely pre-fabricated. This thinner cut of granite often comes with some sort of wood backing to give it more support. These granite slabs are most often found in apartments, prefabricated remodels, or sometimes it is used in furniture, as an end table for example.