钢索穿锥CB3051-1979船用木笔铁笔

插钢丝绳用铁笔

STEEL MARLINE SPIKES

Tapered and sharp pointed iron pin used for opening up a rope when splicing. 

Has a perforation at the larger end to hold a lanyard.

锥形体，用于编插钢丝绳或缆绳用。钎头经高温淬火。后半部分为圆柱体，以方便工作时抓握。