... price 4.Fine workmanship Nodular cast iron for energy-saving lamp 1.Item name: Nodular cast iron2. ... Coating/nickel plating. Inspection tooling:Outer micrometer, inside micrometer(machine),digimatic micrometer, internal micrometer, mechanical caliper , vernier ... caliper ,caliper(digital),caliper(machine),caliper(dial),diameter scale, depth micrometer, digital caliper, ...