The EX-EXP-BANA isn't your typical expanding banana. These guys have some serious gripping power and will never give up their contact strength even over many years of use. Simply rotate the barrel of the connector to tighten in place. Bananas have gotten a bad rap due to the way the cheaper versions function. Have no concerns... these are superb with unmatched contact surface area.

Sold in Red/Black Pairs as shown in picture.