This package comes with 10 pairs of crimp terminals and connectors. ring terminal, electrical contact. Gold plated to protect against corrosion and to ensure increased power flow and the audio without distortion. 4 gauge power wire/ ground wire fork terminals. Alternative for banana plugs. Safer than connecting bare wires. Feature - ColorAssorted Color - Material: Copper - Size: 5/16"(about 8.5mm) ring diameter. Warm tip: The picture is for reference, and please allow 0.1-0.2 inch difference due to manual measurement.(1 inch=2.54cm) - This package comes with 10 pairs of crimp terminals and connectors. 10 red boots and 10 black boots of crimpable ring terminals. - Thick barrel ensures strong crimp to prevent your wire slipping out of the connector. - Premium copper heat tested, gold plated to protect against corrosion and to ensure increased power flow and the audio without distortion. - 4 gauge power wire/ ground wire fork terminals. Thick barrel ensures strong crimp every time, your wire will of these connectors - for garages, auto electricians, mechanics, workshops, etc. Suitable for cars, , motorhomes, etc. Package list: 30 x Red Boot 30 x Black Boot