Perma Lok lacing needles are made from solid brass and have an internal screw thread, which is screwed onto the end of your leather lacing, giving a smooth transition between leather and needle, that is easy to pull through the holes in your lacing project.
This is a Jumbo perma-lok, the medium size in the range and suitable for lacing of 2-4mm. It measures 55mm long, has a 3mm diameter and a smooth, rounded bullet shaped tip.