Apparently requires the HiRose crimping tool (not mentioned on pack), no use with thicker CAT 6 cable.
I couldn't get them to function ...
a) Solid (thick) CAT6 cable didn't fit in the guides at all - imposible.
b) I didn't have the special HiRose crimping pliers as mentioned in the positive review, and used "normal" crimping pliers ... these caused the thinner cables to be cut through - useless.
I used Schwaiger "Easy INstall RJ45" which worked with all types of cable and were much faster.
Nees HiRose crimping pliers (not mentioned on the pack)