Granite Flatness Measuring Surface Plate

granite surface plate High hardness granite inspection surface plate is in black color with bright, homogeneous structure,good stability, high hardness, anti-rust and chemical-resistance. Material: granite Standard: GB/T 20428-2006 Specification: The maximum workability is 3000mm in width and 6000mm in length or customize (special size is acceptable following customers' requirement) Surface: T-slots, dovetail-shaped slots, holes, etc. Hardness of the working surface: HS70