These are 8 awg 1/4 inch Spade Terminals. This price is for a pair of these. One with red and one with black terminal covers shown in the picture.

These work for the amps where a wire ferrule will not work. If you need the ferrules instead you can find them at this link: https://www.franksaudiomotive.com/product-page/wire-ferrules-with-heatshrink