Granite Master Square Pink 5-Face Grade A Inspection Surface Size (In.) 16 x 16 Surface Size (mm) 400 x 400 Thickness (In.) 4 Thickness (mm) 100 Flatness Unilateral Tolerance (In.) 0.0012 Flatness Unilateral Tolerance (mm) 150 Weight (Lbs.) 98 Weight (Kilograms.) 44