Tube terminals 16 - 800 mm², KRF, and 500 - 1000 mm², KRD Data: electrolytic copper, tin plated. Cable inspection hole, for stranded (class 2) and flexible (class 5) Cu-conductors. UL-approved (KRF 16-500 mm²). DNV-approved (KRF 16-400 mm²). Marking example KRF: 95 12F, KRD: 500 16 (Elpress logotype included) 95 = mm² 500 = mm² 12 = palm hole for M12 16 = palm hole for M16 F = type KRF, for stranded and flexible conductors