These are replacement jaws for the Nylon Jaw Pliers. These now come with metal screws. You will need a drill and bit approximatley 1mm - 1.5mm to drill the holes in these parts.
I bought these as a replacement for my nylon jaws as they were used so much that the plastic was wearing down and becoming frayed a bit causing it to catch on the wire when straightening so these replacements a perfect and very much needed.
These are great - the old ones just shattered on me and I was so happy to be able to buy replacements!