Rice Lake 12767 Cast Iron Painted Grip Handle Test Weight, 10kg Mass, NIST Class F Metric and U.S. customary grip-handle test weight for testing field standards and industrial devices Painted cast iron weight has chip-resistant paint that resists corrosion and conforms to NIST Handbook 105-1 standard Sealable adjusting cavity for adjusting total weight Meets National Institute of Standards and Technology (NIST) Class F specification for commercial "Legal-for-Trade" weighing operations