There is nothing worse than losing a race or not making it up a hill due to a coil wire slipping off. To make your coil wire connection full-proof, MSD offers this Coil Wire Retainer. The Retainer is molded from Rynite and features a ''hood'' that pushes down on the coil wire boot and secures it in place. Fits all Blaster Coils (except High Vibration and the Blaster-3) and will work with most other aftermarket canister coils.