Item Surface Plate, Long Form Calibration Certificate No, Material Granite, Application Grade Toolroom, Color Red, Edge Style Two Ledges, Flatness 0.000200 in/0.0050 mm, Grade B, Length 18 in, Surface Size 12 in x 18 in; 300 mm x 200 mm, Thickness 4 in, Standards ASME B89.3.7 2013, U.S. Federal Specification GGG-P-463c, Surface Size (In.) 12 in x 18 in, Surface Size (mm) 300 mm x 450 mm, 12 in
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