Grizzly G9649 9-Inch by 12-Inch by 2-Inch Granite Surface Plate, No Ledge
These tool room grade "B" Granite Plates have a bilateral accuracy of plus or minute .0001" total instrument runout for precision measurements from a common surface base. Granite Plates are harder than steel, non-magnetic, least responsive to temperature changes, practically maintenance free and won't corrode like steel. Available with clamping ledges or without.