Function: These are used to repair worn-out or damaged battery posts by sliding over the post to take up slack, creating a secure and tight connection for the battery cable terminal.
Material: They are typically made from a lead alloy for good electrical conductivity and resistance to rust and wear.
Identification: One shim is marked with a plus sign (+) and the other with a minus sign (-) to indicate which terminal they are intended for.
Installation: Installation is simple, requiring the shim to be placed over the post before attaching the battery terminal