The FilterMAG™ Transmission Magnet (TM360 & TM180) are designed to magnetically attract and hold the millions of steel particles that are circulating in your transmission oil. Unless stopped these particles will damage the delicate parts in your transmission. Snap either the large TM360 or the smaller TM180 on to the bottom of your steel transmission pan. Either one will immediately begin cleaning your transmission oil without restricting oil flow. So Simple!, So Effective !!!