This is a crimp on copper wire to copper wire end cap connector.
Rating: 
Voltage 300v max
Temperature 105c/221f
Flammability rating: 94-V2

Tie reference: 
CE2X for 2x 16G
Lobster AK-25, Die no.5, muromoto Tekko MR30A, Die no. 5.5, 
Air pressure min. 6kg/cm3
Warning: 
Always disconnect from power source or turn off before installing.
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