Calibration Weight Nominal Mass 20 lb Calibration Weight Class 6 Calibration Certificate Traceable - Accredited Calibration Weight Style Hook Calibration Weight Material Stainless Steel Measurement Type Avoirdupois Number of Pieces 1 Finish Satin Calibration Weight Compliance Agency ASTM Overall Height 8.79 in Overall Length 0.187 in Calibration Tolerance 910 mg