RJ45 Crimping Tool Ethernet Crimper for Cat6 Cat5 Cat5e RJ45 Pass Through Connectors and RJ12 Ends Comes with 20PCS RJ45 Cat6 Connectors and Replacement Blade : Amazon.co.uk: DIY & Tools
In an emergency I had to crimp CAT6 cable with thicker wires. The ends are stripped to fit! : r/techsupportmacgyver
Easycrimp/push through CAT6 RJ45 Connectors - 100 Pack