These 6.4mm uninsulated piggyback spade terminals are easy to use. Just crimp them onto the wires as needed. When using, make sure the wires are clean and straight to ensure a good connection. Also, check that the size of the terminal matches your wire. As for maintenance, keep them in a dry place to prevent rust. If they are tin - plated, avoid scratching the plating. Since the parts can be either brass or tin - plated depending on stock, be aware of their different properties when using. You can trust these terminals as we have 25 years of experience in supplying appliance parts.