These wire ferrules are an excellent way to dress up your amplifiers install. These are for amps where fork terminals will not fit properly. 

I sell these individually. These ferrules are verified to fit my 16g Tspec wire and also the 16-18g Primary wire.

I buy in bulk for my own installs so I can offer these to you cheaper than anywhere else. Feel safe using the same parts that I do, a veteran installer of over 15 years.