Steel wire ropes with excellent wear proof and crush resistant performance, good durability and high breaking force, are used as drilling lines. The 6 x 19 classification of wire ropes includes standard 6 strands, round strand ropes with 16 through 26 wires per strand. The 6 x 36 classification of wire ropes includes standard 6 strands, round strand ropes with 27 through 49 wires per strand. All the steel wire ropes conform to API 9A and API Monogram can be used.