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If you're going 4ga in to an amp, place the ferrule on the wire, insert into the amplifier, and tighten the set screw.
If you're going to a terminal, use this;
If you're going to a terminal, use this;

10 Tons Hydraulic Wire Battery Cable Lug Terminal Crimper Crimping Tool With 9 Pairs of Dies - - Amazon.com
10 Tons Hydraulic Wire Battery Cable Lug Terminal Crimper Crimping Tool With 9 Pairs of Dies - - Amazon.com
www.amazon.com