Item Surface Plate Material Granite Application Grade Inspection Color Pink Edge Style Flat Flatness 0.000150 in/0.0038 mm Grade A Length 18 in Surface Size 18 in x 24 in 450 mm x 600 mm Thickness 6 in Case Type Crate Flatness Unilateral Tolerance (In.) 0.000150 Flatness Unilateral Tolerance (mm) 0.0038 Includes Case No Standards ASME B89.3.7 2013 GGG-P-463c Surface Size (In.) 18 in x 24 in Surface Size (mm) 450 mm x 600 mm Weight (Kilograms.) 113 kg 24 in Weight (Lbs.) 248