Material: Cu 99.95%, tin plated Cu/Sn.Inspection holeFor stranded (class 2), multi-stranded (class 5) and very flexible (class 6) Cu conductors according to IEC 60228For class 5 and class 6 Cu conductors Elpress recommends the Dual system.UL approved (KRF16-500 mm²), DNV approved (16-400 mm²).Example of marking KRF: 17 (neck) Elpress logotype 70 10F (palm)17 = Die No. 70 = mm² 10 = palm hole for M10 F = type KRF for class 2, 5 and 6 conductors.