Cast iron inspection surface plate with T-slot: Material: HT200-300 Standard: GB/T22095-2008 Specification: 100x200-3000x8000mm or customize Surface: flat (accessories are available according to your requirement, like V, T, straight-shaped slots and tapped holes, long holes, grid lines, etc) Hardness of the working surface: HB160-240 Surface treatment: hand-scraped, finish-milling or ground finish Foundry process: sand casting or centrifugal casting Molding type: resin sand molding Painting: primer and face paint Surface coating: pickling oil and plastic-lined or covered with anticorrosion paint Surface flatness: Master, Working, Reference Precision grade: 1-3 Working temperature: (20±5)? Packaging: wooden box